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4. Solve problems :

A. What is the ratio of molecules in 1 mole of NH3 and 1 mole of HNO3 .

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Correct answer is 1:1 

one mole of any substance,compound , or elements contain particles equal to avagadro's number i.e. 6.022×1023 

 1 mole of NH3 =6.022×1023  molecules of NH3

and 

1 mole of HNO3 =6.022×1023  molecules of HNO3 

Ratio=6.022×10236.022×1023 

therefore , the ratio of molecules of NH3  and HNO3 is 1:1

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