Question

calculate the number of molecules present in 4.4g of co2 (at mass:c=12,o=16,na= 6.02×10 ratio to power 23

Answer 1

Weight of CO2 in gram per moles=
=(12) + (16*2)
=12+32
=44 g/moles.
Now, for 4.4 grams of CO2, we get
4.4/44 = 0.1 moles
Now, number of molecules:-
0.1 * 6.022 * 10²³
= 0.6022 * 10²³
= 6.022 * 10²² molecules.

Answer 2

Number of molecules in 4.4g of $\bold{\mathrm{CO}_{2} =6.022 \times 10^{22}}$

EXPLANATION:

The ‘molar mass’ of carbon (C) = 12.011 g/mol

The ‘molar mass’ of oxygen (O) = 31.998 g/mol

Total ‘molar mass’ of $\mathrm{CO}_{2}$ = 44.009 g/mol

Moles $=\frac{\text {the given mass}}{\text {total molar mass}}$

Moles $=\frac{4.4}{44}$ = 0.1 mol

Moles $=\frac{4.4}{44}$ = 0.1 mol

The formula for number of molecules $=\text { total moles of molecules } \times \mathrm{N}_{\mathrm{A}}$

Number of molecules in 4.4g of $\mathrm{CO}_{2}$ = $0.1 \times 6.022 \times 1022$

Number of molecules in 4.4g of $\mathrm{CO}_{2} =6.022 \times 10^{22}$

The "number of molecules" in a known mass of an element or compound is calculated based on the fact that 'one mole of a compound ' contains $6.022 \times 10^{22}$ molecules and this number is the Avogadro constant.