Question

1. Calculate the mass of 12.044 x 1023 molecule of oxygen (O2).

2. Calculate the mass of 3.011 x1024 atoms of carbon.

3. Calculate the number of moles in 12.044 x1024 atoms of phosphorus.​

Answer 1

Explanation:

1)no.of molecules=moles*NA

12.044*10²³=moles*6.022*10²³

moles=12.044*10²³/6.022*10²³

moles=2

mass=moles*molecular weight

=2*32

=64 gm

2)no.of atoms=no.of C atoms*no.of molecules

3.011*10²⁴=1*no.of molecules

no. of molecules=3.011*10²⁴/1

no. of molecules=3.011*10²⁴

moles*NA=3.011*10²⁴

moles*6.022*10²³=3.011*10²⁴

moles=3.011*10²⁴/6.022*10²³

moles=0.5*10

moles=5

mass=moles*molecular weight

=5*12

=60gm

3)no.of atoms of P=no.of total atoms*no.of molecules

12.044*10²⁴=1*no.of molecules

no. of molecules=12.044*10²⁴/1

no. of molecules=12.044*10²⁴

moles*NA=12.044*10²⁴

moles*6.022*10²³=12.044*10²⁴

moles=12.044*10²⁴/6.022*10²³

moles=2*10

moles=20

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