Question

the no. of moles of ammonia that have the same mass as tbat of 3 moles of Co2 is
i) 0.19 mol
ii) 2.58 mol
iii) 9.04 mol
iv) 7.76 mol

Answer 1

The correct option is D : 7.76mol

Explanation :
Atomic mass of carbon=12u
oxygen=16u
molecular mass of CO2=12+2x16=12+32=44u
molar mass = 44g 

1mole of CO2 contains 44g

3 moles of CO2 ---?

=3x44/1=132g

Molar mass of NH3=14+3x1=17g

Formula : Number of moles= Given weight/molar mass
=132/17
=7.76 moles
∴ Number of moles=7.76 mol