Question

1. how many moles are in 30.0 g argon? 0.751 mol 1.20 x 10³ mol 1.33 mol 0.400 mol clear all

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 and $M$ is the molar mass. The molar mass of argon ($Ar$) is approximately $M = 39.95\ g/mol$.

Step2: Substitute values

We are given $m = 30.0\ g$ and $M=39.95\ g/mol$. Then $n=\frac{30.0\ g}{39.95\ g/mol}\approx0.751\ mol$.

Answer:

0.751 mol