Question

The molecular mass of octane is 114.22 g/mol. What is the mass of 22.05 mol of octane?
5.180 g
22.05 g
114.22 g
2,518 g

Answer 1

Correct Answer
Fourth Option, 2518 g

Solution:
The formula of number of moles (n) in terms of mass of the compound(m) and molar mass of the compound (M) can be stated as:

$n= \frac{m}{M}$

We have the number of moles of Octane. 
So,
n = 22.05 moles

We have the molar mass of octane.
So,
M=114.22 g/mol

Using these values in the above formula we can calculate mass of Octane (m).

$22.05= \frac{m}{114.22} \\ \\ m=22.05*114.22 \\ \\ m=2518.551$

Therefore, the mass of 22.05 moles of Octane is 2518 g.

Answer 2

Answer:

D. 2,518

Explanation:

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