I need help with a few question in GC...
1) What is the percentage of Oxygen by mass in a 200 gram sample of CuSO4 5H2O
I understand that 200 g is an extraneous information. This is how I solved the problem:
1) I found the overall molas mass of the sample by adding the weights and multiplying by coefficients whenever required (i.e. for oxygen and hydrogen)= (approximately) 250
2)Then I found out the mass of Oxygen: 4(16) + 5(16)
3) Divide mass of oxygen by overall mass from step 1
My question is: why the heck does KBB in step 2 multiply 4(16) x 5(16) instead of adding like I did? Am I missing something? Can someone please explain this to me? Thanks..
1) What is the percentage of Oxygen by mass in a 200 gram sample of CuSO4 5H2O
I understand that 200 g is an extraneous information. This is how I solved the problem:
1) I found the overall molas mass of the sample by adding the weights and multiplying by coefficients whenever required (i.e. for oxygen and hydrogen)= (approximately) 250
2)Then I found out the mass of Oxygen: 4(16) + 5(16)
3) Divide mass of oxygen by overall mass from step 1
My question is: why the heck does KBB in step 2 multiply 4(16) x 5(16) instead of adding like I did? Am I missing something? Can someone please explain this to me? Thanks..
