Chemistry, asked by krishana0121, 6 months ago

Calculate the number of moles in 8 gram of Oxygen gas and number of moles in 52 grams of

helium. (Atomic mass O= 16 u, He= 4 u).​

Answers

Answered by rajanbalami03
1

mole of oxygen is 0.5

mole of helium is 13

Answered by Asterinn
12

We have to find out the number of moles in :-

  1. 8 grams of Oxygen gas (O2)
  2. 52 grams of helium (He)

We know that :-

n \:  =  \dfrac{given \: mass}{molar \: mass}

where :- n = number of moles.

1. 8 grams of Oxygen gas (O2) :-

⟹ Atomic mass O= 16 u

⟹ Molar mass of O2 = 2× 16

⟹ Molar mass of O2 = 32 u

n \:  =  \dfrac{given \: mass}{molar \: mass}

Put :-

  • given mass = 8
  • molar mass = 32

 \implies \: n  =  \dfrac{8}{32}

 \implies \: n \:  =  \dfrac{1}{4}

 \implies \: n \:  =  0.25

2. 52 grams of helium ( He) :-

⟹ Atomic mass He = 4 u

n \:  =  \dfrac{given \: mass}{molar \: mass}

Put :-

  • given mass = 52
  • molar mass = 4

\implies \: n  =  \dfrac{52}{4}

\implies \: n  =  \dfrac{13}{1}

\implies \: n  =  13

Answer :

  • number of moles in 8 gram of Oxygen gas = 0.5

  • number of moles in 52 grams of helium = 13

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