If you weigh a sample of Magnesium metal to be 45g, how many moles do
you have?

Answers

Answer 1

Answer:

[tex]\boxed {\boxed {\sf 1.9 \ moles \ Mg}}[/tex]

Explanation:

To convert from grams to moles, the molar mass is used. This tells us the grams in 1 mole of a specific substance. It can be found on the Periodic Table.

Magnesium (Mg): 24.305 g/mol

Use the molar mass as a ratio.

[tex]\frac { 24.305 \ g \ Mg}{1 \ mol \ Mg}[/tex]

Multiply by the given number of grams.

[tex]45 \ g \ Mg *\frac { 24.305 \ g \ Mg}{1 \ mol \ Mg}[/tex]

Flip the fraction so the grams of magnesium can cancel.

[tex]45 \ g \ Mg *\frac {1 \ mol \ Mg }{24.305 \ g \ Mg}[/tex]

[tex]45 *\frac {1 \ mol \ Mg }{24.305 }[/tex]

[tex]\frac {45 \ mol \ Mg }{24.305 }[/tex]

[tex]1.85147089076 \ mol \ Mg[/tex]

The original measurement of grams has 2 significant figures, so our answer must have the same.

For the number of moles we calculated, that is the tenth place. The 5 in the hundredth place tells us to round the 8 to a 9.

[tex]1.9 \ mol \ Mg[/tex]

45 grams of magnesium is about 1.9 moles.


Related Questions

Can light from the sun cause ink to become visible

Answers

_______。o*★*o。______— Answer☕

Yes. Light from the sun can pull energy out of the ink, causing it to become visible

___________________________________

Sorry if wrong

why is a saturated solution of magnesium hydroxide less basic than a saturated solution of potassium hydroxide?

A.) magnesium hydroxide is less soluble than potassium hydroxide

B.) magnesium is less basic than potassium

C.) magnesium hydroxide solutions are just as basic as potassium hydroxide solutions

D.) when magnesium hydroxide dissolved the hydroxide ion is partially neutralized

Answers

Answer:

letter C I'm not sure to my answer but hope it can hrlp

The reason why magnesium hydroxide is  less basic than a saturated solution of potassium hydroxide is that magnesium hydroxide is less soluble than potassium hydroxide.

What is a saturated solution?

A saturated solution is one that contains as much solute as it can normally hold at a particular temperature.

We know that magnesium hydroxide is less soluble than potassium hydroxide. Hence, the reason why magnesium hydroxide is  less basic than a saturated solution of potassium hydroxide is that magnesium hydroxide is less soluble than potassium hydroxide.

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how many moles of C8 H18 are present in a 546.23 gram sample?​

Answers

Answer:

Given:

Compound C8H18

mass of compound- 546.23 gram

To find:

number of moles =?

Solution:

let's find out the molar mass of C8H18= 12×8+18×1 = 114 gram/mole

Number of moles= given mass/molar mass

=546.23/114

= 4.7818436487 moles.

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write down the sp-notation for cl-37​

Answers

Its nucleus contains 17 protons and 20 neutrons for a total of 37 nucleons. Chlorine-37 accounts for 24.23% of natural chlorine, chlorine-35 accounting for 75.77%, giving chlorine atoms in bulk an apparent atomic weight of 35.453(2) g/mol. (1s2, 2s2, 2p6, 3s2)

A student is given a sample of unknown substance. He is asked to determine
if it is classified as a metal, a metalloid, or a non-metal. He discovered that the unknown element conducted some heat and electricity, had a shiny surface, and broke easily. This element is most likely a

Metal

Non-metal

Metalloid

Cannot be determined

Answers

the answer is: the element is most likely to be a METALLOID

The unknown element is most likely a metalloid. Metalloids have  shiny surface  and conduct electricity less than metals but are brittle in nature.

What are metalloids?

Metalloids are a class of elements having chemical and physical properties intermediate to that of metals and non-metals.

Like metals, metalloids have shiny  surfaces and appear like a metal but they conduct heat and electricity not as much as metals do.

Boron, germanium, silicon etc. are metalloids and they can form alloys with other metals to be useful in many applications. Metalloids are brittle in nature and thus break easily.

Hence, the sample that the student have is a metalloid and 3rd option is correct.

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What is the total number of molecules of hydrogen in 0.25 mole of hydrogen?
1
6.0 10^23
2.
4.5 * 10^23
3
3.0 x 10^23
4
1.5 * 10^23

Answers

0.25 mole of hydrogen contains 1.5 * 10^23 molecules  of hydrogen gas.

We have to know that the number of molecules in one mole of a substance is obtained from the Avogadro's number.

We know that;

1 mole of hydrogen contains 6.02 × 10^23 molecules of hydrogen

0.25 mole of hydrogen contains 0.25 mole × 6.02 × 10^23 molecules/1 mole

= 1.5 * 10^23 molecules

Therefore, 0.25 mole of hydrogen contains 1.5 * 10^23 molecules  of hydrogen gas.

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Atoms that have the same number of outer electrons
OA.
are all metallic elements.
B. must be atoms of the same element.
OC.
are all nonmetallic elements.
OD.
belong to the same family of elements.

Answers

I can see two answers, I’d go with D, but all neutral atoms, of the same element would have the same number of outer electrons. However, if you consider that some of the atoms might be ions, that would eliminate B.

1. What do the colors indicate about the change in average temperature over time from 1884 to
2012?

Answers

the colors show that the average temperature increased since 1880 and 2012

The colors used to indicate the change in average temperature over time from 1884 to 2012 can vary depending on the specific visualization or representation being used.  However, in many temperature visualizations, a common color scheme is employed to represent temperature anomalies or changes relative to a reference period.

In this color scheme, cooler temperatures are often represented by shades of blue or green, while warmer temperatures are depicted by shades of yellow, orange, or red. The intensity or darkness of the colors may also correspond to the magnitude of the temperature change.

For example, if a visualization shows a map with regions colored in blue or green, it suggests that those areas experienced a cooling trend or had lower average temperatures during the specified time period. Conversely, if the map shows regions colored in yellow, orange, or red, it indicates a warming trend or higher average temperatures.

By examining the distribution of colors on the visualization, one can gain insights into the spatial patterns and changes in average temperatures over the specified time frame.

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Identify the three basic ingredients used in glass and give an example of each​

Answers

Answer:

Sand (SiO2 silica) In its pure form it exists as a polymer, (SiO2)n.

Soda ash (sodium carbonate Na2CO3) ...

Limestone (calcium carbonate or CaCo3) or dolomite (MgCO3)

Explanation:

I am pretty sure you know what sand is, Soda ash is a fine white colored powder that is extracted from the ashes of plants growing in sodium rich soils. Limestone is is a common type of carbonate sedimentary rock.  

A sealed 1.0L flask is filled with 0.500 mols of I_2 and 0.500 mols of Br_2. When the container achieves equilibrium the equilibrium constant is 1.10x10^{-2}. What is the equilibrium concentration of the product, IBr?

Answers

Answer:

[IBr] = 0.049 M.

Explanation:

Hello there!

In this case, according to the balanced chemical reaction:

[tex]I_2+Br_2\rightarrow 2IBr[/tex]

It is possible to set up the following equilibrium expression:

[tex]K=\frac{[IBr]^2}{[I_2][Br_2]} =0.0110[/tex]

Whereas the the initial concentrations of both iodine and bromine are 0.50 M; and in terms of [tex]x[/tex] (reaction extent) would be:

[tex]0.0110=\frac{(2x)^2}{(0.50-x)^2}[/tex]

Which can be solved for [tex]x[/tex] to obtain two possible results:

[tex]x_1=-0.0277M\\\\x_2=0.0245M[/tex]

Whereas the correct result is 0.0245 M since negative results does not make any sense. Thus, the concentration of the product turns out:

[tex][IBr]=2x=2*0.0249M=0.049M[/tex]

Regards!

What measurement describes the pressure of gas

Answers

Answer:

a manometer

Explanation:

A manometer can be used to measure the pressure of a gas. The (difference in) height between the liquid levels (h) is a measure of the pressure. Mercury is usually used because of its large density.

Why do hurricanes occur near the equator and not further North? Why do they
become weaker as they hit the land?

Answers

Answer:

the occur near the equator bc its- bc its warm and they get weak bc it slows them down

Explanation:

The value of Avogadro number is

Answers

the value of Avogadro number is 6.02214076 × 10^24

Atoms of nickel and aluminum tend to
A. bond ionically to other metals.
B. be radioactive.
C. form anions.
D. form cations.

Answers

Answer: D. form cations.

I think

Explanation:

I too the text D.form cations

6. Certain materials can act as indicators because they change
a. Acidity
b. Color
c. Concentration
d. Taste

Answers

Answer:

B

Explanation:

An alloy is an example of a
a.solid mixture but not a solution.
b.liquid solution.
c.solid solution.
d.gaseous solution.

Answers

Answer would be C because an alloy is a metal made by combining two metals!

Translation is the conversion of
1 .RNA to DNA.
2. DNA to RNA.
3. DNA to protein.
4. RNA to protein.

(WILL MARK BRAINLIEST)

Answers

RNA to protein.

Translation is the process of translation messenger RNA to a chain of amino acids.

Translation is the conversion of RNA to protein. The conversion of RNA to DNA is called reverse transcription.

What do you mean by Proteins?

Proteins may be defined as natural-appearing, extremely complex substances that consist of amino acid residues joined by peptide bonds.

The process of translation occurs in the cytoplasm of the cells, while the process of transcription occurs in the nucleus itself.

The conversion of DNA to RNA is called transcription. While the proteins are never directly converted from DNA, it involves both processes of transcription followed by the translation.

Therefore, translation is the conversion of RNA to protein.

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Two adaptations to plants are described below:
Adaptation 1: A hornwort is a nonflowering plant that produces a large number of spores instead of seeds.
Adaptation 2: A kangaroo paw has tiny, woolly hairs on it that help it hold onto water droplets.
Which statement is true about these adaptations?

Answers

Answer:

The answer is D

Explanation:

The hornwort is telling what that exact plant does and the kangaroo paw is telling what they do physically to hold onto water

The first adaptation is to the life cycle, and the second is to the physical traits thus, the kangaroo paw describes what they physically do to hold onto water, and the hornwort describes what that particular plant performs. So, the correct option is D.

What is Adaptation?

A species or organism gradually grows more accustomed to its surroundings through the process of adaptation. The behavioral or physical characteristics of an animal that improve its ability to thrive in its ecosystem are referred to as adaptation. Animals can adapt by changing how they look to hide from predators (camouflage). To survive in their habitats, different species have evolved various adaptations.

In the above given example, the life cycle is the first adaptation, and the physical characteristics are the second. Therefore, the hornwort defines what that particular plant does, and the kangaroo paw represents what they physically do to hold onto water.

Therefore, the correct option is D.

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As a bond between a hydrogen atom and a
sulfur atom is formed, electrons are
A. shared to form an ionic bond
B. shared to form a covalent bond
C. transferred to form an ionic bond
D. transferred to form a covalent bond

Answers

it is b shared to form a covalent bond

Explanation:

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

why is it commonly believed that carbon dioxide is responsible for global warming?

Answers

Answer:

Because of pollution and other factors that contain carbon dioxide are warm, and it heats up the air.

Explanation:

Carbon dioxide levels in the Earth's atmosphere have been steadily decreasing. Carbon dioxide has a longer average lifetime in the atmosphere. The warming effect associated with carbon dioxide has remained unchanged

Solutions, _____ colloids, _____ light.

a) like, will not scatter
b) unlike, will not scatter
c) like, will scatter
d) unlike, will scatter

Answers

Answer: unlike, will not scatter

Explanation:

Colloids are unlike solutions because their dispersed particles are much larger than those of a solution. The dispersed particles of a colloid cannot be separated by filtration, but they scatter light, a phenomenon called the Tyndall effect.

The nucleus contains:

protons and electrons
protons and neutrons
electrons
protons, neutron, and electons

Answers

Explanation:

protons, neutrons and electrons

Answer:

An atom contains protons, neutrons and electrons BUT A NUCLEUS CONTAINS PROTONS AND NEUTRONS ONLY.

which statement is true about the reaction shown by this chemical equation HCl + NaOH ------> NaCl + H2O

Answers

Answer:

A. It is exothermic

Explanation:

This reaction of acid and base represents synthesis reaction because new subsatnces are produced.

What is synthesis reaction?

Synthesis reactions are reactions that occur when two different atoms combines to form a different molecule. A synthesis reaction can be represented by the equation i.e. A + B → C. In this equation, the A and B represent the reactants whereas the C represents the product.

So we can conclude that option C is the correct answer which is the synthesis reaction.

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A double replacement reaction is a reaction in which one element replaces a similar element within a compound
True
False

Answers

Answer:

False

Explanation:

. What you’re describing is a displacement reaction.

Answer:

False, that is a single replacement reaction that you have described.

Explanation:

Please help due soon.

Answers

Answer:

water - Yes because the do drink water

Air - yes they need to breath or alse they would not do good

warmth - yes or they die from coldness

Light - yes to get there food

soil - yes nution for there roots

Explanation:

Hopes it helps

Answer: all yessss
I know because I’m smart

(10pts) Post-Lab Questions Answer the following questions. (2pts) Suppose the concentration of the NaOH solution was 0.5 M instead of 0.1 M. Would this titration have required more, less, or the same amount of NaOH solution for a complete reaction? Choose... (2pts) Suppose you used 0.5 M NaOH to titrate your vinegar sample instead of 0.1 M. What effect does the concentration of base added have on the reliability of the results of your titration? Choose... (2pts) Consider a 0.238 M aqueous solution of sodium hydroxide, NaOH. How many grams of NaOH are dissolved in 23.46 mL? (2pts) How many individual hydroxide ions (OH−) are found in 23.46 mL? (2pts) How many moles of sulfuric acid, H2SO4, are neutralized by 23.46 mL of 0.238 M NaOH(aq)? [Hint: begin by writing a balanced equation for this neutralization reaction.] Total: -/28 pts

Answers

Answer:

A) Less amount of NaOH will be required

B) Reliability decreases with increase in concentration of NaOH solution

C) Mass of NaOH = 0.223 g

D) Number of hydroxide ions = 3.36 × 102²¹

E)Moles of H₂SO₄ neutralized = 0.00279 moles of H₂SO₄

Explanation:

A) Since the number of moles of acetic acid in the vinegar sample is constant, the number of moles of NaOH reacting with acetic acid is constant as well.

Volume = number of moles / concentration

Assuming, number of moles = 1, concentration = 0.1 M

Volume = 1/0.1 = 10

With increase in concentration,

Volume = 1/0.5 = 2

Therefore, less amount of NaOH will be required

B) An increase in concentration of base added will results in lesser volume of based used. This will result in an increase in percentage error as well as decrease innthe accuracy of determining the endpoint. Hence, reliability decreases

C) mass = concentration × volume × molar mass

Molar mass of NaOH = 40.0 g, volume of NaOH = 23.46 mL = 0.02346 L, concentration = 0.238 M

Mass of NaOH = 0.238 × 0.02346 × 40

Mass of NaOH = 0.223 g

D) number of moles of NaOH in 0.223 g = 0.233/40 = 0.00558 moles

1 mole of NaOH produces 1 mole of hydroxide ions; 0.00558 moles of NaOH will produce 0.00558 moles of hydroxide ions

Number of hydroxide ions in 0.00558 moles = 0.00558 × 6.02 × 10²³

Number of hydroxide ions = 3.36 × 102²¹

E) H₂SO₄ + 2 NaOH ----> Na₂SO₄ + 2 H₂O

1 mole of H₂SO₄ requires 2 moles of NaOH for complete neutralization

There are 0.00558 moles of NaOH in 23.46 mL of 0.238 M NaOH solution.

Moles of H₂SO₄ required to neutralize 0.00558 moles of NaOH = 0.00558/2

Moles of H₂SO₄ neutralized = 0.00279 moles of H₂SO₄

Crystallisation description of method

Answers

Answer:

Crystallization is a method for transforming a solution into a solid, where a supersaturated solution nucleates the solute by a chemical equilibrium controlled process. Uniform particles with well-defined morphology are formed, and these readily re-dissolve

Explanation:

Answer:

Crystallization or crystallisation is the process by which a solid forms, where the atoms or molecules are highly organized into a structure known as a crystal. Some of the ways by which crystals form are precipitating from a solution, freezing, or more rarely deposition directly from a gas.

seven carbon chain with CH3 attached to second and third carbon

Answers

Answer:

2,3-dimethylheptane.

CH₃ - CH - CH-CH₂-CH₂-CH₂-CH₂

           |        |

       CH₃    CH₃

Explanation:

Hello there!

In this case, according to the given instructions, it is possible to draw the organic chemical structure by connecting seven carbon atoms along the parent chain with two methyl substituents at the second and third carbon atoms; thus, the resulting structure is:

CH₃ - CH - CH-CH₂-CH₂-CH₂-CH₂

           |        |

       CH₃    CH₃

Furthermore, the name would be 2,3-dimethylheptane according to the IUPAC rules for nomenclature.

Best regards!

the work is in the photo can i get answers please (;´༎ຶٹ༎ຶ`)​

Answers

Answer:

yes

Explanation:

it is

The mass of a brick is 5 grams. If the brick is smashed into little pieces, the total mass of all the pieces will be
5 grams
o less than 5 grams
O more than 5 grams
What will the mass be if the brick was smashed

Answers

Answer:

I am not sure but i think it is 5 grams

Explanation:

because the total mass= 5g

so it is a physical change so no new substance is formed

so the total mass = total mass of all the broken pieces

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