Question

Helium gas consists of of separate He atoms rather than molecules. How many helium atoms, he,, are there in 2.0g of helium? M=4.0 kg/kmol for He.

Answer 1

Helium gas consists of separate He atoms rather than molecules. How many helium atoms, he,, are there in 2.0g of helium? M=4.0 kg/kmol for He.

Solution:

Let:

$$m = 2,0\,g$$ $$M = \frac{4,0\,K\,g}{K\,mol} = \frac{4,0\,g}{mol}$$ $$N = ?$$

Such as 1mol of substance contain Na (Avogadro constant) particles: $(Na = 6.22 \times 10^{23})$

$$N = \frac{m}{M} \times Na$$ $$N = \frac{2.0}{4.0} \times 6.22 \times 10^{23} = 3.11 \times 10^{23}$$

Answer:

$$3.11 \times 10^{23}$$

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