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Standard XIII

Chemistry

Atoms and Molecules

The formula u...

Question

The formula unit masses of CaO and MgO are _ and _ respectively.
[Atomic masses of Ca, Mg and O are 40 u, 24 u and 16 u respectively.

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Solution

The formula unit mass of $C a O$
$= (1 \times atomic mass of Ca)$ + $(1 \times atomic mass of O)$
$= (1 \times 40) + (1 \times 16)$
$= 56 u$

The formula unit mass of $M g O$
$= (1 \times atomic mass of Mg)$ + $(1 \times atomic mass of O)$
$= (1 \times 24) + (1 \times 16)$
$= 40 u$

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The formula unit masses of CaO and MgO are _____ and _____ respectively. [Atomic masses of Ca, Mg and O are 40 u, 24 u and 16 u respectively.

The formula unit mass of CaO =(1×atomic mass of Ca) + (1×atomic mass of O) =(1×40)+(1×16) =56 u The formula unit mass of MgO =(1×atomic mass of Mg) + (1×atomic mass of O) =(1×24)+(1×16) =40 u

The formula unit masses of CaO and MgO are _ and _ respectively.
[Atomic masses of Ca, Mg and O are 40 u, 24 u and 16 u respectively.

The formula unit mass of $C a O$
$= (1 \times atomic mass of Ca)$ + $(1 \times atomic mass of O)$
$= (1 \times 40) + (1 \times 16)$
$= 56 u$

The formula unit mass of $M g O$
$= (1 \times atomic mass of Mg)$ + $(1 \times atomic mass of O)$
$= (1 \times 24) + (1 \times 16)$
$= 40 u$