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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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one mole of any substance,compound , or elements contain particles equal to avagadro's number i.e. 6.022$$\times 10^{23}$$

$$\therefore$$ 1 mole of NH3 =6.022$$\times 10^{23}$$  molecules of NH3

and

1 mole of HNO3 =6.022$$\times 10^{23}$$  molecules of HNO3

$$\therefore Ratio ={6.022\times 10^{23}\over 6.022\times 10^{23}}$$

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

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