hello! got some chemistry questions i need help on

Question

1. How many atoms of chlorine are in 40 g of CCl4?
2. How many moles of CO2 are there if a sample of CO2 has 5.0x1023 atoms of oxygen?

Answer 1

Hello Sadie,

a) 40gCCl4 x (1mol CCl4 / 152g CCl4) x (4mol Cl / 1mol CCl4) x (6.022*10^23 atoms Cl / 1mol Cl) = 6.34*10^23 atoms of Cl

b) (5*10^23) atoms O2 x (1mol O2 / 6.022*10^23 atoms O2) x (1mol CO2 / 1mol O2)= 0.83 mol CO2

I hope this helps!