Question

learning: molecules and compounds calculations
question ⓘ
molar mass is the mass of 1 mole, in grams, of a given substance. this results
in the units of g/mol for molar mass. the number of grams is determined by
adding up the atomic masses of the individual elements on the periodic table.
molar mass is a conversion factor that can be used to determine the number
of moles in a given number of grams or vice versa. the conversion factor for
molar mass would be the following:
$\frac{\text{g}}{1\text{ mole}}$ or $\frac{1\text{ mole}}{\text{g}}$
how many grams of krypton, kr, are found in 2.093 mol of kr?
answer
○ 0.02498 g of kr
○ 40.03 g of kr
○ $5.701 \times 10^{-3}$ g of kr
○ 175.4 g of kr
○ i dont know yet
submit

Explanation:

Step1: Find molar mass of Kr

From periodic table, molar mass of Kr is $83.80\ \frac{\text{g}}{\text{mol}}$.

Step2: Calculate mass of Kr

Multiply moles by molar mass:
$\text{Mass} = 2.093\ \text{mol} \times 83.80\ \frac{\text{g}}{\text{mol}}$
$\text{Mass} = 2.093 \times 83.80 = 175.4\ \text{g}$

Answer:

175.4 g of Kr