Question

Please give me the answer

Answer 1

1. we know that,

the mass of 1 mole oxygen = 16g

now,
the mass of 0.2 mole oxygen =(0.2×16)g
=3.2 g

2. we know that,

the mass of 1 mole water molecule =18g

now,
the mass of 0.5 mole water molecule,
=(0.5×18)g
=9g

is it your answer please mark as brainalist

Answer 2

$\huge\pink{As-Salamu-Alykum}$

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Mass of Oxygen =?

Moles of Oxygen =0.2mol

Molar mass of oxygen = 16 g/mol

Mass of oxygen = Moles × Molar mass

Mass of oxygen = 0.2 ×16

Mass of oxygen =3.2 g

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Mass of H2O =?

Moles of H2O = 0.5mol

Molar mass of H2O =18g/mol

Mass of H2O = moles × molar mass

Mass of H2O = 0.5×18

Mass of H2O = 9 g

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$\huge\purple{INSHALLAH\;it\;will\;help\;U}$