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Question

A sample of ammonium phosphate (NH4)3PO4 contains 3.18 mol of hydrogen atoms. The number of moles of oxygen atoms in the sample is:

A
0.265 mol
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B
0.795 mol
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C
1.06 mol
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D
4.00 mol
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Solution

The correct option is C 1.06 mol

In (NH4)3PO4
Ratio of number of moles of Hydrogen atoms to Oxygen atoms is 12:4=3:1

So,
H/O=3/1
Given, moles of hydrogen atoms = 3.18 mol
= 3.18/O=3/1
moles of oxygen atom O=3.18/3
Moles of O atoms = 1.06 mol


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