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Which of the following has maximum number of molecules ? a. 7 g N2 b. 2 g H2 c. 8 g O2 d.20 g NO2


gaikwadomkar124 27th Jun, 2020
Answers (3)
Sourav singh 28th Nov, 2021

Hello Gaikwadomkar,

As we know to find maximum number of molecules  we have to divide the given mass by its molar mass to get moles, then multiply times 6.022×1023 molecules1 mol

Now to answer your question 1 mole of any element contain 6.023 x 1023 number of molecules.

1 g mole of N2 = 28 g N2 => 7 g N2 = 0.25 g mole N2

1 g mole of O2 = 32 g O2  => 16 g of O2 = 0.5 g mole O2

1 g mole of H2 = 2 g H2 => 2 g H2 = 1.0 g mole H2

1 g mole NO2 = 14 + 16 x 2 = 46 => 16 g of NO2 = 0.35 mole NO2

2 g H2 (1 g mole H2) contain maximum molecules.

hope  this will help you a lot.

thank you.

Shivraj Pawar 19th Dec, 2020

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ADITYA KUMAR Student Expert 27th Jun, 2020

Hello

The correct option is b) 2g H2

EXPLANATION

we know that,

No. of moles is given by

= Molecular weight (M)/ given Weight (W)

Therefore,

(a) No. of moles in a option =7 /28= 0.25 moles

(b) No. of moles in b option i.e H2=2/2 = 1 mole

(c) No. of moles in c option =16 /46= 0.347 moles

(d) No. of moles in D option =16 /32= 0.5 moles

Now as H2 has maximum no. of moles, thus it has maximum no. of molecules

Thank you

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