Question

calculate the no. of moles in 64 g of oxygen molecules
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Answer 1

Answer:

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 2

Answer:

O2 mass = 16+16 u

= 32u

one mole of O2 = 32g

therefore, 64g = 64/32

= 2moles of O2

hope it helped :)