Question

QI. Calculate the number of moles for the tollowing:
(2) 22 g of carbon dioxide
(b) 12.044 x 1023 number of water molecules
(Atomic mass of C = 12 u, O = 16 u, Avogadro number = 6.022 x 1023]

Answer 1

Explanation:

ans.of (2) mass of substance (CO2)=22g

mass of one mole CO2 = 44g

no. of moles = 22/44

= 0.5 moles

Answer 2

Answer:

a)0.5,b)2

Explanation:

a) no of moles=given mass/molar mass

=22/44

=0.5 (MM=1×12+2×16 =44)

b)no of moles= no of molecules/avagadro no

=12.044×1023/6.022×1023

=2