Question

1. How many atoms of P are in 5 moles of P4010?

2. 1.0 x 10^20 atoms of Fe is equivalent to how many moles of Fe?
3. How many moles of P4O10 are produced when we react 8 moles of phosphorus with oxygen?
4. How many atoms of hydrogen are contained in 100g of methane (CH4)

Answer 1

1) Assuming you mean Phosphorous Pentoxide (P4O10) there are 6.02x10^23 x 4 (number of P in P4O10) x 5 moles = 1.38x10^25

2) Divide 1.0x10^20/6.02x10^23 = 1.7x10^-4 moles

3) The balanced equation would be 4P + 5O2 —-> P4O10. Starting with 8 moles of P 8/4 = 2. You generate 2 moles P4O10

4) CH4 has a molecular mass of 12+4 = 16. Starting with 100g/16g/mole = you have 6.25 moles of methane. As there are 4 atoms of hydrogen in each molecule of methane, you multiply 6.25 moles methane by 4 atoms H/molecule and get 25 moles of hydrogen or 1.505e25 atoms of hydrogen

Step-by-step explanation: