Question

Calculate the No. of moles in the following :

64 g oxygen molecule (O2
)
12 g Helium ​

Answer 1

Explanation:

molar mass of oxygen is 16 grams, it means that 1 mole oxygen weighs 16 grams. therefore 64 gram oxygen = 64/16 = 4 mole oxygen. 1 mole of any element contains 6.022 * 10^23 atoms in it. hence 4 moles of oxygen.

Answer

Number of moles in 12gram helium is

number of moles =given mass / molar mass.

molar mass of helium=4.

No of moles of helium=12/4.

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