chemistry question

Question

 The chemical formula for copper (II) sulfate pentahydrates is CuSO4*5H2O.

Please answer the following in number only; example, 4

How many copper (Cu) atoms in copper (II) sulfate pentahydrates?   

How many sulfur (S) atoms in copper (II) sulfate pentahydrates?   

How many oxygen (O) atoms in copper (II) sulfate pentahydrates?  

How many hydrogen (H) in copper (II) sulfate pentahydrates? 

Do not round and use significant figures,

what is the molar mass for copper (II) sulfate pentahydrates 

For mass percent, please use 4 significant figures; example, 15.00%

What is the mass percent for copper (Cu)?    

What is the mass percent for sulfur (S)?   

What is the mass percent for oxygen (O)?   

What is the mass percent for hydrogen (H)?   

Answer 1

Hello, Emily,

Thanks for adding your responses. That bis very useful.

I agree with all of the atom counts.

For the next questions I have made comments:

what is the molar mass for copper (II) sulfate pentahydrates 63.55 This is the atomic weight of copper. We need to add the other atoms to get a molar mass of the entire molecule. I get 249.60 g/mole.

For mass percent, please use 4 significant figures; example, 15.00%

Add the masses of the individual atoms in a molecule. Then divide those masses by the molecular weight (249.60) to find the mass % of that element.

What is the mass percent for copper (Cu)?    25.46%

What is the mass percent for sulfur (S)?    12.84%

What is the mass percent for oxygen (O)?    57.69%

What is the mass percent for hydrogen (H)?    4.01%

Total = 100%

Bob