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Molecular Mass

Write the nam...

Question

Write the names of the following compounds and deduce their molar masses.
$N a_{2} {S O}_{4}, K_{2} {C O}_{3}, {C O}_{2}, {M g C l}_{2}, N a O H, {A l P O}_{4}, {N a H C O}_{3}$

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Solution

$N a_{2} S O_{4}$ : Sodium sulphate
Molar Mass : $23 (2) + 32 + 16 (4)$ = $46 + 32 + 64$ = $142$ g/mol

$K_{2} C O_{3}$ : Potassium carbonate
Molar Mass : $39 (2) + 12 + 16 (3)$ = $78 + 12 + 48$ = $138$ g/mol

$C O_{2}$ : Carbon dioxide
Molar Mass : $12 + 16 (2)$ = $12 + 32$ = $44$ g/mol

$M g C l_{2}$ : Magnesium chloride
Molar Mass : $24 + 35.5 (2)$ = $95$ g/mol

$N a O H$ : Sodium hydroxide
Molar Mass : $23 + 16 + 1$ = $40$ g/mol

$A l P O_{4}$ : Aluminium phosphate
Molar Mass : $27 + 31 + 16 (4)$ = $27 + 31 + 64$ = $122$ g/mol

$N a H C O_{3}$ : Sodium bicarbonate
Molar Mass : $23 + 1 + 12 + 16 (3)$ = $23 + 1 + 12 + 48$ = $84$ g/mol

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