Find out the amount of calcium oxide formed from 4 g of calcium metal [ Ca = 40 u; O = 16 u ] Ca + O2 → CaO
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Answer:Correct option is C)
The atomic mass of Ca=40 g/mol.
20 g of Ca=
40g/mol
20g
=0.5mol
0.5 moles of Ca will give 0.5 moles of CaO.
The molecular weight of Ca=40+16=56 g/mol.
0.5 moles of CaO=0.5mol×56g/mol=28 g.
The weight of calcium oxide formed by burning 20 g of calcium in excess oxygen is 36 g
Hence, the option (C) is the correct answer.
Explanation:
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