Question

9.7× 10^17 atoms of iron wiegh as much as 1 cc of H2 at STP. What is the atomic mass of iron..???

Answer 1

Answer:

Explanation:

We know for gases at STP - 1mol of gas has a volume of 22.4L or 22,400cc (cm cube)For H2. 2.016g of H2 at STP = 22,400ccMass of 1 cc of H2 = 2.016 /22400 = 0.00009g We know is that 1 mol of anything contains 6.022*10^23 molecules or atoms for monoatomic elements. So, from the question: 9.7*10^17 atoms of Fe has mass = 0.00009g 6.022*10^23 atoms has mass = (6.022*10^23)/ (9.7*10^17) * 0.00009 = 55.87g Answer: 1 mol Fe has mass = 55.87g OR atomic mass of Fe = 55.87