Question

Q2. The molecular mass of water is
A20 u
B 18 u
C 21 u
D 3 u

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Answer 1

Answer:

B. 18u

Explanation:

One mole of H2O is made up of 2 moles of hydrogen atoms and 1 mole of oxygen atoms.

Mass of two moles of hydrogen atom= 2*1 g/mol=

2g/mol.

Mass of one mole of water = 2g/mol + 16g/mol

=18g/mol..

answer.