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Question

State True or False.
1 mole of Ca react with a half mole of oxygen gas to form 1 mole of CaO which weighs 56 gm.

A
True
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B
False
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Solution

The correct option is A True
The given statement is True.
1 mole of Ca react with half mole of oxygen gas to form 1 mole of CaO which weighs 56 gm.

Ca+12O2CaO
The atomic masses of Ca and O are 40 gm/mol and 16 g/mol respectively.
The molar mass of CaO 40+16=56 gm/mol.
Thus, mass of 1 mole of CaO will be 56 gm.

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