Question

What is the mass in grams of the following?

(a) 3 moles of NaOH 

(b) 6.023 × 10²² atoms of Ca 

(c) 224 L of CO₂

Answer 1

(a) 3 moles of NaOH 

Mass of 3 moles of NaOH = 3 × mol. mass of NaOH 

GMM of NaOH = 23 + 16 + 1 = 40 g 

Mass of 3 moles of NaOH = 3 × 40 = 120 g 

(b) 6.023 × 10²² atoms of Ca = n × atomic mass of ca

= 4 g 

(c) 224 L of CO₂ 

Mass of 224 L of CO₂

= 10 × 44 

= 440 g