6) how many grams are in 11.9 moles of chromium?\n7) how many moles are in 9.8 grams of calcium?\n8) how…

6)

Explanation:

Step1: Recall molar - mass of chromium

The molar mass of chromium (Cr) is approximately 52.00 g/mol.

Step2: Use the formula $m = n\times M$

where $m$ is mass, $n$ is the number of moles, and $M$ is the molar mass. Given $n = 11.9$ moles and $M=52.00$ g/mol, then $m=11.9\times52.00$. $m = 11.9\times52.00=618.8$ g

7)

Explanation:

Step1: Recall molar - mass of calcium

The molar mass of calcium (Ca) is approximately 40.08 g/mol.

Step2: Use the formula $n=\frac{m}{M}$

where $n$ is the number of moles, $m$ is mass, and $M$ is the molar mass. Given $m = 9.8$ g and $M = 40.08$ g/mol, then $n=\frac{9.8}{40.08}\approx0.2445$ moles

8)

Explanation:

Step1: Recall molar - mass of arsenic

The molar mass of arsenic (As) is approximately 74.92 g/mol.

Step2: Use the formula $m = n\times M$

where $m$ is mass, $n$ is the number of moles, and $M$ is the molar mass. Given $n = 238$ moles and $M = 74.92$ g/mol, then $m=238\times74.92$. $m=238\times74.92 = 17830.96$ g

Answer:

6. 618.8 g
7. 0.2445 moles
8. 17830.96 g