Question

Calculate the number of molecules present in the 100g for both water and carbon dioxide.

Answer 1

h20 = 18g (gam)

co2=44g(gam)

in 100g

h2o will be

100/18=5.55 *6.022 *10^23

co2 will be

100/44=2.27*6.022 *10^23

hope it helps

Answer 2

$33.1\times 10^{23}$ molecules of water and $13.8\times 10^{23}$ molecules of carbon dioxide

Explanation:

According to Avogadro's law, 1 mole of every substance occupies 22.4 Liters at STP and contains avogadro's number 6.023\times 10^{23} of particles.

To calculate the moles, we use the equation:-

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

a) for water

$\text{Number of moles of water}=\frac{100g}{18g/mol}=5.5mol$

1 mole of water $(H_2O)$ contains=$6.023\times 10^{23}$ molecules of water.

5.5 mole of water $(H_2O)$ contains=$\frac{6.023\times 10^{23}}{1}\times 5.5=33.1\times 10^{23}$ molecules of water.

b)  for carbon dioxide

$\text{Number of moles of carbon dioxide}=\frac{100g}{44g/mol}=2.3mol$

1 mole of carbon dioxide $(CO_2)$ contains=$6.023\times 10^{23}$ molecules of carbon dioxide.

2.3 mole of  carbon dioxide $(CO_2)$  contains=$\frac{6.023\times 10^{23}}{1}\times 2.3=13.8\times 10^{23}$ molecules of  carbon dioxide

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