Question

compound: p₄c
mass of compound: 67.20g
molar mass: \tconvert mass to moles:

compound: mg(oh)₂
mass of compound: 26.5g
molar mass: \tconvert mass to moles:

compound: nahco₃
mass of compound: 60.70g
molar mass: \tconvert mass to moles:

compound: cucl₂
mass of compound: 50.8g
molar mass: \tconvert mass to moles:

Explanation:

Step1: Calculate molar mass of P₄C

Molar mass = $(4\times30.97)+12.01 = 135.89\ \text{g/mol}$

Step2: Convert mass to moles (P₄C)

$\text{Moles} = \frac{67.20}{135.89} \approx 0.4945$
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Step1: Calculate molar mass of Mg₃(PO₄)₂

Molar mass = $(3\times24.31)+(2\times(30.97+4\times16.00)) = 262.87\ \text{g/mol}$

Step2: Convert mass to moles (Mg₃(PO₄)₂)

$\text{Moles} = \frac{26.5}{262.87} \approx 0.1008$
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Step1: Calculate molar mass of NaHCO₃

Molar mass = $22.99+1.01+12.01+(3\times16.00) = 84.01\ \text{g/mol}$

Step2: Convert mass to moles (NaHCO₃)

$\text{Moles} = \frac{60.70}{84.01} \approx 0.7225$
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Step1: Calculate molar mass of CuCl₂

Molar mass = $63.55+(2\times35.45) = 134.45\ \text{g/mol}$

Step2: Convert mass to moles (CuCl₂)

$\text{Moles} = \frac{50.8}{134.45} \approx 0.3778$

Answer:

Compound	Molar Mass (g/mol)	Moles
$\text{Mg}_3(\text{PO}_4)_2$	$262.87$	$0.101$
$\text{NaHCO}_3$	$84.01$	$0.723$
$\text{CuCl}_2$	$134.45$	$0.378$