There are 3.45 moles of (nh_4)_2 so_4, how many grams is this?

455.4 g (NH_4)2 SO_4

Explanation:

Given:

no of moles of (NH_4)2 SO_4 , n=3.45 moles

To find:

The mass (w) of (NH_4)2 SO_4 in 3.45 moles (n)of it.

Molar mass (M) of (NH_4)2 SO_4 = 132 g

No of moles n is given by the formula;

n is no. of moles

w is mass of the compound

M is the molar mass of the compound

Substituting the values in the formula,

w=3.45 × 132=455.4g

4d^55s^1 ( third choice)