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Calculate the mass of 2×10^23 molecules …

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Calculate the mass of 2×10^23 molecules of nitric acid

Posted by Subhjot Kaur 5 years, 8 months ago

CBSE > Class 11 > Chemistry

1 answers

Rohit Krishna 5 years, 8 months ago

We know that, No. of moles =Total no. of molecules/Avogadro no. Therefore,no. of moles of nitric acid(HNO3)=2*10^23/6*10^23.=1/3 moles... (We have approximated 6.022*10^23 as 6*10^23 to solve the problem easily) Now,we know that no.of moles=given mass/molar mass Let x be the given mass of nitric acid. Molar mass of nitric acid=63 Substituting the values,we get, 1/3=x/63 Therefore,x=21g

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