Question

unit 3 comprehensive quiz l
how many moles are in 54.3 grams of na?
o 597 moles
o 2.36 moles
o 4.94 moles
o 1250 moles

Explanation:

Step1: Recall molar - mass formula

The formula to calculate the number of moles $n$ is $n=\frac{m}{M}$, where $m$ is the mass in grams and $M$ is the molar mass in g/mol. The molar mass of sodium (Na) is approximately $M = 22.99\ g/mol$.

Step2: Substitute values

We are given $m = 54.3\ g$ and $M=22.99\ g/mol$. Substitute these values into the formula: $n=\frac{54.3\ g}{22.99\ g/mol}\approx2.36\ mol$.

Answer:

2.36 moles