12. The molar mass of water is 18.0
g/mol. A mass of 90.0 grams of
water is equivalent to how many
moles?
HELP ASAP!!!
Answers
Answer:
5moles
Explanation:
number of moles=mass/molar mass
The molar mass of water is 18.0 g/mol. A mass of 90.0 grams of water is equivalent to 5 moles. Therefore, option B is correct.
What is molar mass ?The mass in grams of one mole of a substance is defined as its molar mass. Molar mass is measured in grams per mole, abbreviated as g/mol. The isotopic atomic mass of a single isotope of any given element is a value that compares the mass of that isotope to the mass of the isotope carbon-12.
A compound's molar mass can be calculated by adding the standard atomic masses (in g/mol) of its constituent atoms.
A compound's molar mass indicates the mass of one mole of that substance. In other words, it tells you how many grams of a compound there are per mole. As a result, the units for molar mass are grams/mole.
number of moles = mass / molar mas
= 90.0 grams / 18.0grams
= 5 moles
Thus, option B is correct.
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Related Questions
in the reaction 2Na + CI2 --> 2NaCI the products are
Answers
Answer:
The products in this equation are CI2
Explanation:
The reasoning as to why the CI2 is considered the products is because it is on the right side of the plus sign, and on the left side is called reactants.
While dinner was cooking, Rachel noticed that there was steam coming from a pot of boiling water. Which of the following statements best explains why there is steam coming from the pot?
There is a chemical change as the water is reacting with the pot to make steam.
There is a chemical change as the water is evaporating, producing a gas.
There is a physical change as a water is condensing, producing a gas.
There is a physical change as the water is evaporating, producing a gas.
Answers
Answer:
There is a physical change as the water is evaporating, producing a gas.
A block of concrete has a mass of 5100 g and a volume of 2500 cm3 . Calculate the density.
Answers
Answer:
2.04 g/cm3
Explanation:
Density = mass ÷ volume
= 5100 ÷ 2500
=2.04 g/cm3
A solution of pH 7 has
Group of answer choices
the same concentration of H+ and OH‑
more OH- than H+
no H+ and no OH-
more H+ than OH-
Answers
Answer: same concentration
Explanation:
H+ makes it more acidic, OH- makes is more basic. 7 is neutral so it has the same amount of both.
Does anyone know the ones that are blank
Answers
Answer:
yeah whats it asking for
Explanation:
Heating water so that it boils is an example of _____.
Answers
Answer:
Exothermic change
Explanation:
Hope this helps and sorry if it isnt the answer you were looking for.
The molar mass of CO2 is 44g/mol. How many grams are in 3 mol CO,?
Answers
Answer:
We assume you are converting between moles CO2 and gram. You can view more details on each measurement unit: molecular weight of CO2 or grams This compound is also known as Carbon Dioxide. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles CO2, or 44.0095 grams.
Answer:
Assuming the question was about 3 mol CO2 - it's 132g. Assuming it's about CO - it's 84g.
Explanation:
The molar mass of X means "a mole of X weighs that".
So 1 mol CO2 weighs 44g, so 3 moles will weigh three times that - 132g.
Now, with CO, we need to compute the molar mass of CO. One particle of CO is comprised of 2 atoms - a Carbon atom and an Oxygen atom, with molar masses ~12g and ~16g respectively. That brings us to molar mass of CO of 28g and the mass of 3 mol CO of 28g*3 = 84g
what is the color of the flame when magnesium burns in air
Answers
Answer:
Will u give me brainliest
white
In its pure form, it is silvery white, and relatively soft. It burns in air with a brilliant white light, and for this reason is often used in flares and fireworks. Magnesium is used in disposable flash bulbs to generate light for photography, but this use has been largely supplanted by other sources of illumination
Given the equation Ca + H2O --> Ca(OH)2 + H2 how many grams of calcium will react completely with 10.0 grams of water? *
Answers
Answer: 11.0 g of calcium will react with 10.0 grams of water.
Explanation:
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]
moles of [tex]H_2O[/tex]
[tex]\text{Number of moles}=\frac{10.0g}{18g/mol}=0.55moles[/tex]
The balanced chemical equation is:
[tex]Ca+2H_2O\rightarrow Ca(OH)_2+H_2[/tex]
According to stoichiometry :
2 moles of [tex]H_2O[/tex] require = 1 mole of [tex]Ca[/tex]
Thus 0.55 moles of [tex]H_2O[/tex] require=[tex]\frac{1}{2}\times 0.55=0.275moles[/tex] of [tex]Ca[/tex]
Mass of [tex]Ca=moles\times {\text {Molar mass}}=0.275moles\times 40g/mol=11g[/tex]
Thus 11.0 g of calcium will react with 10.0 grams of water.
Santos and Lüderitz are the same distance from the equator, and both cities are near the ocean. The air temperature in Lüderitz is colder than the air temperature in Santos. What causes the air temperature in these places to be different? Explain what causes the difference as completely as you can.
Please help i need answers A.S.A.P
Answers
Answer:
pies
Explanation:
i am confused and cant find a explanation i am sad
Santos and Luderitz have a difference in the temperature despite being at the same distance from the equator because of the oceanic currents, and the topographical factors.
What are oceanic currents?Oceanic currents are the directional movement of the oceanic and the seawater by the Coriolis Effect, density, sea level, and gravity, these movements affect the temperature of the area.
The sea level and the oceanic currents play a role in determining the temperature of the region as it affects the humidity, warm and cold wind, and environmental and other topographical factors.
Therefore, the difference in oceanic currents results in different temperatures.
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Describe what a phase diagram is
Answers
Answer:
The graph which shows under what conditions of temperature and pressure distinct phases of matter occur is called phase diagram.
How many moles are in 6.7 grams of sodium hydroxide?
How many grams are in 2.5 moles of calcium carbonate?
Answers
Answer:
see explanation
Explanation:
grams => moles => divide by formula weight
moles => grams => multiply by formula weight
a. 6.7 grams NaOH = 6.7g/40g/mol = 0.17 mole
b. 2.5 moles CaCO₃ = 2.5 moles x 100g/mol = 250 grams
There are two reactants
in a chemical equation
and one product. The
mass of the product is
30g. The mass of the
first reactant is 17g.
What must the mass of
the second reactant be,
if the equation is to
follow the law of
conservation of mass?
PLEASE HELP ME
Answers
Answer:
13g
Explanation:
The law of conversation of matter tells us that in a chemical reaction, matter is never created or destroyed, it's simply converted from one form to another. So the mass of reactants should always equal the mass of the products in a chemical reaction.
Therefore, if the total mass of the products is 30g, that means that the reactants have a mass of 17g + the other reactant to = 30g.
30g - 17g = 13g
In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 11.0 grams. What is his percent yield?
Answers
Answer:
Option D.
Explanation:
Percentage yield = Actual yield / Theoretical yield * 100%
Actual yield = 11.0 grams
Theoretical yield = 12.3 grams
Percentage yield = 11.0 / 12.3 * 100
Percentage yield = 89.43%
Which of the following is the correct calculation for determining the density of an object with a mass of 54 g and a volume of 6mL
Answers
Answer:
d=m/v=9
Explanation:
Refer to the following balanced equation in which ammonia reacts with nitrogen monoxide to produce nitrogen and water.
4NH3(g) + 6NO(g) -> 5N2(g) + 6H2O(l)
How many moles of NH3 are necessary to produce 0.824 mol N2?
___mol NH3
(Note the question must be answered with three significant figures)
Answers
Answer: 0.659 mol
Explanation:
From the equation, we can tell that for every 4 moles of ammonia consumed, 5 moles of nitrogen are produced.
This means the answer is 0.824(4/5)=0.659 mol
Where in the atom are the electrons that are used to form bonds located
Answers
Answer:
The outer shell or Valence shell
Explanation
'nuff said
How many molecules are in 1.56 moles of NaCl?
Answers
Answer:
9.39432 x10^23
Explanation:
no of particles = moles * avogradros no
=> 1.56 * 6.022 x10^23
= 9.39432 x10^23
Hey I'm Chloe can you Help me, Thank you :)
How does photosynthesis use solar energy?
Answers
Answer:
Photosynthesis in plants converts solar energy into chemical energy using electrons and protons from water.
Explanation:
A bond formed when atoms share electrons is a(n) __________.
a. crystal lattice
b. molecule
c. ion
d. ionic bond
e. chemical bond
f. covalent bond
Answers
Answer:
I think it is a covalent bon
Which of the following is a unit of mass?
A.
newton
B.
kilogram
C.
meter
D.
tesla
Answers
Answer:
B. kilogram
Explanation:
The basic SI unit of mass is the kilogram.
:))
<3
hey pleaseeeeeeeeeeeeeeeeeeeeeeee
Answers
Answer: B
Explanation:
Answer:
b
Explanation:
HELP ME PLEASE (brainliest)
Answers
Answer: i would say D or the last one.
Explanation: According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants. The law of conservation of mass is useful for a number of calculations and can be used to solve for unknown masses, such the amount of gas consumed or produced during a reaction.
Hope this helps :) Can u plz mark me branliest
GIVING 38 POINTS AWAY PLEASE HELP ME WITH BOTH QUESTIONS!!!!
Answers
Answer:
C
B
Explanation:
throwing cotton balls causes the person to blink.
and Its not an allergic reaction so it's more of stomach pain that sneezing
Answer:
it should be c for the first one then b for the second one
Explanation:
hope it helps :)
help :) plz :) ........
Answers
Answer:
D. 4:3
Explanation:
The mole ratio is simply the coefficients in a balanced chemical reaction and their relation to each other. For example, the mole ratio between Al and [tex]Al_{2}O_{3}[/tex] is 2:1, and the ratio between [tex]O_{2}[/tex] and [tex]Al_{2}O_{3}[/tex] is 3:2.
What atomic species are present in all hydrocarbons?
Answers
Answer:
Hydrogen
Carbon (iv) oxide
How is bond polarity determined?
Answers
Answer:
Explanation:
Are you a gril or boy
Explanation:
you use it yo determine the polarity of a covalent bond using numerical means find the difference between the electron gravity of atoms ; if the result is between 0.4 and 1.7 then generally the bond is polar covalent . pls follow and mark brainliantest
if you are correct you get a brainless
Tarek would like to germinate pumpkin seeds for his science project. He wraps the seeds in a dry paper towel and places them on the windowsill. Tarek waits, but the seeds will not grow. What conditions should Tarek have used to germinate the seeds? (2 points)
a
The paper towel should be wet, and the seeds should be placed in a dark place.
b
The dry paper towel should be placed in a pot filled with soil.
c
The paper towel should be dry and transparent.
d
The seeds should be placed in a dark place.
Answers
Answer:
A.
Explanation:
❤️
Answer: it’s A. The paper towel should be wet, and the seeds should be placed in a dark place.
Explanation: I hope this helps!
aerobic cellular respiration requires an adequate supply of
Answers
Answer:
oxygen ?
Explanation:
not sure but I think so
Aerobic cellular respiration requires an adequate supply of oxygen. In the presence of oxygen, the cell completely oxidised the glucose molecule to form ATP.
What is cellular respiration?In cellular respiration, the cell takes glucose and breaks it down to form energy. Cellular respiration is of two types: aerobic respiration and anaerobic respiration.
In aerobic respiration, the cell requires oxygen. Due to the presence of oxygen, the complete oxidation of glucose takes place. Glucose is converted into pyruvic acid and then enters the Krebs cycle and the electron transport chain to make ATP.
In the aerobic cellular respiration process, the maximum amount of ATP is derived. In anaerobic respiration, the cell performs respiration without the presence of oxygen. An example is glycolysis.
In this glycolysis process, the complete oxidation of glucose does not take place. In the absence of oxygen from pyruvate, lactic acid and ethanol are produced. This is called fermentation.
Hence, for aerobic cellular respiration, oxygen is required.
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What is the molecular formula for a compound that is 33.38% sulfur and 66.62% oxygen and has a molar mass of 192.14g?
What is the molecular formula for a compound that is 26.37 % carbon, 5.541% hydrogen, 52.70 % oxygen and 15.38% nitrogen and has a molar mass of 182.16g?
Answers
Explanation:
HOPE IT WILL HELP YOU TO SOLVE YOUR PROBLEM
The molecular formula for a compound that is 33.38% sulfur and 66.62% oxygen and has a molar mass of 192.14 g is SO₄, and the molecular formula for a compound that is 26.37% carbon, 5.541% hydrogen, 52.70% oxygen, and 15.38% nitrogen and has a molar mass of 182.16 g is C₉H₈NO₃.
What is the significance of the molecular formula?The molecular formula of a compound is a way to represent the number and types of atoms that make up a molecule and is used to identify and distinguish between different compounds, which is important in chemistry and biochemistry as it can help predict the compound's physical and chemical properties.
Hence, the molecular formula for a compound that is 33.38% sulfur and 66.62% oxygen and has a molar mass of 192.14 g is SO₄, and the molecular formula for a compound that is 26.37% carbon, 5.541% hydrogen, 52.70% oxygen, and 15.38% nitrogen and has a molar mass of 182.16 g is C₉H₈NO₃.
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