Question

Which of the following would weigh the highest?
(a) 0.2mole of sucrose(C12H22O11)
(b)2 mole of CO2
(c) 2 mole of CaCO3
(d) 10 mole of H2O

Answer 1

Highest weight is

(c) 2 mole of CaCO₃

The molecular mass of C₁₂H₂₂O₁₁ is = 12(12) + 22(1) + 11(16) gm

= 342 gm

0.2 moles of it weigh = 0.2*342 gm = 68.4gm

The molar mass of CO₂ is = 12 + 2(16) gm = 44gm

2 moles of it weigh = 2*44 = 88gm

The molar mass of CaCO₃ weigh = 40 + 12 + 3(16) = 100gm

2 mole of it weigh = 2*100 gm = 200gm

Molar mass of H₂O is = 2(1) + 16 = 18gm

10 mole of it weigh = 10*18 gm = 180gm

So, option (c), 2 mole of CaCO₃ has the highest weight.

Answer 2

Answer:

Option c is the correct answer