Question

mass and atoms quick check
the molar mass of ammonia (nh₃) is 17.03 g/mol. which expression correctly shows how to determine the number of moles of ammonia equivalent to 5 g?
○ 5g×\frac{1mol}{17.03g}
○ 5g×\frac{17.03g}{1mol}
○ 5g×\frac{1g}{17.03mol}
○ 5g×\frac{17.03mol}{1g}

Explanation:

Step1: Recall the formula for moles

The formula for calculating the number of moles \(n\) is \(n=\frac{m}{M}\), where \(m\) is the mass and \(M\) is the molar mass.

Step2: Substitute the values

Given \(m = 5g\) and \(M=17.03g/mol\), we can rewrite the formula as \(n = 5g\times\frac{1mol}{17.03g}\).

Answer:

\(5g\times\frac{1mol}{17.03g}\) (the first option)