How many moles are in 6.7 grams of sodium hydroxide?
How many grams are in 2.5 moles of calcium carbonate?
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
All systems disperse their energy spontaneously?
Is it true or false? and WHY?
Answer:
True.
Explanation:
Yes, all systems disperse their energy spontaneously because all types of energy spontaneously flows from concentrated to dispersed if it is not hindered by any material in their way. Energy can be prevented from spreading by materials such as containers. If there is no substance in the path of energy so it can disperse automatically from a concentrated region to a lower region.
help :) plz :) ........
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.
I can be formed into a sheet, I am high in luster, and am a very good conductor. I must be a ...
a
metal
b
nonmetal
c
metalloid
d
noble gas
Answer: metal
Explanation:
hey pleaseeeeeeeeeeeeeeeeeeeeeeee
Answer: B
Explanation:
Answer:
b
Explanation:
Given the equation Ca + H2O --> Ca(OH)2 + H2 how many grams of calcium will react completely with 10.0 grams of water? *
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.
Hey I'm Chloe can you Help me, Thank you :)
How does photosynthesis use solar energy?
Answer:
Photosynthesis in plants converts solar energy into chemical energy using electrons and protons from water.
Explanation:
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
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
The molar mass of CO2 is 44g/mol. How many grams are in 3 mol CO,?
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
Describe what a phase diagram is
Answer:
The graph which shows under what conditions of temperature and pressure distinct phases of matter occur is called phase diagram.
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)
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
Answer:
The outer shell or Valence shell
Explanation
'nuff said
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-
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.
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
Answer:
d=m/v=9
Explanation:
A block of concrete has a mass of 5100 g and a volume of 2500 cm3 . Calculate the density.
Answer:
2.04 g/cm3
Explanation:
Density = mass ÷ volume
= 5100 ÷ 2500
=2.04 g/cm3
Does anyone know the ones that are blank
Answer:
yeah whats it asking for
Explanation:
4) How many atoms are present in a sample of oxygen, O2 with 12.222 moles?
Answer:
two oxygen atoms
you want 200 mL of a 0.1 g/mL solution of sugar. how do you prepare the solution?
Heating water so that it boils is an example of _____.
Answer:
Exothermic change
Explanation:
Hope this helps and sorry if it isnt the answer you were looking for.
How is bond polarity determined?
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
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
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.
Learn more about oceanic currents here:
https://brainly.com/question/22143254
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HELP ME PLEASE (brainliest)
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
The products of a chemical reaction are chemically different substances than the reactants of a chemical reaction.
True or false?
this statement is true
Answer:
Hope it helps u
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?
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%
i need a short paragraph (about two sentences) describing the geologic time scale.
The geologic time scale is the “calendar” for events in Earth history. It subdivides all time into named units of abstract time called—in descending order of duration—eons, eras, periods, epochs, and ages.
What atomic species are present in all hydrocarbons?
Answer:
Hydrogen
Carbon (iv) oxide
How many molecules are in 1.56 moles of NaCl?
Answer:
9.39432 x10^23
Explanation:
no of particles = moles * avogradros no
=> 1.56 * 6.022 x10^23
= 9.39432 x10^23
what is on the left side ?
Answer:
reactants
Explanation:
aerobic cellular respiration requires an adequate supply of
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.
To learn more about cellular expression, refer to the following link:
https://brainly.com/question/3928558
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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.
Answer:
There is a physical change as the water is evaporating, producing a gas.