Question

question 7
0.1 pts
how many moles are in 6.91 grams of potassium to the correct number of significant figures? input the numeric value.

Explanation:

Step1: Recall molar - mass of potassium

The molar mass of potassium (K) is approximately 39.10 g/mol.

Step2: Use mole - 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. Given $m = 6.91$ g and $M=39.10$ g/mol. Then $n=\frac{6.91}{39.10}$.

Step3: Calculate the result

$n=\frac{6.91}{39.10}\approx0.177$ mol.

Answer:

0.177