Correct Answer: Option A

Explanation

Given: 

m = 25g

n = 0.4

M = ?

Using Number of moles, n = \(\frac{mass}{Molar mass}\)

                                        M = \(\frac{m}{n}\)

                                        M = \(\frac{25}{0.4}\)

                                        M = 62.5g

There is an explanation video available below.

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