Calculate the number of molecules in 11 g of $C{{O}_{2}}$

CBSE Class 9 CBSE Class 9 Science
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1

Calculate the number of molecules in 11 g of $C{{O}_{2}}$. [Atomic mass of C and O are 12 u and 16 u respectively]

2

Molar mass of $C{{O}_{2}}$ = 12 + 2 x 16 = 44 g mol-1
44 g of 1 mole of C02 contains number of molecules = 6.022 x${10}^{23} $
.’. 11 g ofC02 will contain number of molecules _ 6.022 x ${10}^{23} $ x 11 / 44
= 1.5055x ${10}^{23} $ molecules