Question

calculate the number of moles for 10 billion molecules of ammonia.

Answer 1

10 billion molecules of ammonia nothing but 1000,00,00,000 molecules of ammonia
1 mole of ammonia contains 6 into 10 power 23 molecules of ammonia
therefore the number moles of ammonia in 10 billion molecules of ammonia are
$( {1}^{10} ) \div 6 \times {10}^{23 } = 0.33 \times {10}^{13}$

Answer 2

Number of moles for 10 billion molecules of ammonia is $1.66\times 10^{-14}$  

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given molecules}}{\text{Avogadros number}}$

Given molecules = $10\times 10^9$

Avogadro's number =  $6.023\times 10^{23}$

Putting in the values we get:

$\text{Number of moles}=\frac{10\times 10^9}{6.023\times 10^{23}}=1.66\times 10^{-14}moles$

The number of moles for 10 billion molecules of ammonia is $1.66\times 10^{-14}$  

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