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3 years ago

Calculate the mass of 120cc of nitrogen gas at ntp.How many number of molecules are present in it.Easy step of mole concept

Chemistry

1 answer:

bekas [8.4K]3 years ago

6 0

Explanation:

The formula of nitrogen gas is given as;

N₂

Given volume of the gas = 120cm³

Now,

We need to find the number of molecules and the mass of this compound

Solution:

At STP;

1 mole of gas occupies a volume of 1dm³ ;

1000cm³ = 1dm³

120cm³ gives 0.12dm³;

Now;

1dm ³ of gas contains 1 mole of substance at STP

0.12dm³ will contain 0.12mole of nitrogen gas at STP

Mass of N₂ gas = number of moles x molar mass of N₂

Molar mass of N₂ = 2(14) = 28g/mol

Mass of N₂ = 0.12 x 28 = 3.36g

1 mole of a substance contains 6.02 x 10²³ molecules

0.12 mole of N₂ will contain 0.12 x 6.02 x 10²³ = 7.22 x 10²²molecules

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3 years ago

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3 years ago

Calculate the mass of 120cc of nitrogen gas at ntp.How many number of molecules are present in it.Easy step of mole concept​

Calculate the mass of 120cc of nitrogen gas at ntp.How many number of molecules are present in it.Easy step of mole concept