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
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mole of oxygen is 0.5
mole of helium is 13
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We have to find out the number of moles in :-
- 8 grams of Oxygen gas (O2)
- 52 grams of helium (He)
We know that :-
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
Put :-
- given mass = 8
- molar mass = 32
2. 52 grams of helium ( He) :-
⟹ Atomic mass He = 4 u
Put :-
- given mass = 52
- molar mass = 4
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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