20 grams of hydrogen fluoride gas, hf, is dissolved in 0.5 liters of solution. determine the molarity (m).

Explanation:

Step1: Calculate molar mass of HF

The molar mass of H is approximately 1 g/mol and F is approximately 19 g/mol. So, molar mass of HF ($M_{HF}$) = 1 + 19 = 20 g/mol.

Step2: Calculate moles of HF

The formula for moles ($n$) is $n=\frac{m}{M}$, where $m$ is mass and $M$ is molar - mass. Given $m = 20$ g and $M_{HF}=20$ g/mol, then $n=\frac{20}{20}=1$ mol.

Step3: Calculate molarity

The formula for molarity ($M$) is $M=\frac{n}{V}$, where $n$ is the number of moles and $V$ is the volume of the solution in liters. Given $n = 1$ mol and $V = 0.5$ L, then $M=\frac{1}{0.5}=2$ M.

Answer:

2