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  • Can someone help me with this, What is the percentage mass of N in a mixture of 0.5 mole NH3and 1 mole Ca(NO3)2.

What is the percentage mass of N in a mixture of 0.5 mole NH3 and 1 mole Ca(NO3)2.

  • Option 1)

    16.23%

  • Option 2)

    12.17%

  • Option 3)

    10.23%

  • Option 4)

    20.28%

 

Answers (1)

As we learnt in

Molar Mass -

The mass of one mole of a substance in grams is called its molar mass.

- wherein

 Molar mass of water = 18 g mol-1

 

Total moles of N = 0.5 + 2\times 1 = 2.5

Total mass of N = 2.5 \times 14 = 35

Total mass of mixture = 0.5\times 17 + 1\times 164 = 172.5g

\therefore Percentage = \frac{35 \times 100}{172.5} = 20.28\%

 


Option 1)

16.23%

Incorrect

Option 2)

12.17%

Incorrect

Option 3)

10.23%

Incorrect

Option 4)

20.28%

Correct

Posted by

subam

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