Question

What is the mass, in grams, of 2.50×10−3 mol of ammonium phosphate?

Answer 1

0.3725 grams

Step-by-step explanation:

Step-1

The chemical formula for ammonium phosphate is (NH4)3PO4.

Each molecule of ammonium phosphate has 3 nitrogen atoms, 12 hydrogen atoms, one phosphorous atom and 3 oxygen atoms.

Step-2

Let us calculate molecular weight of ammonium phosphate

Atomic weight of Nitrogen = 14

Atomic weight of Hydrogen = 1

Atomic weight of Phosphorous = 31

Atomic weight of Oxygen = 16

Molecular weight of Ammonium phosphate = 3*14+12*1+1*31+4*16=149

One mole of ammonium phosphate weighs 149 grams.

Hence 2.5*
`10^(-3)` moles will weigh 2.5 *
`10^(-3)` * 149 = 372.5 *
`10^(-3)` =0.3725 grams.