Molar Mass (VCE SSCE Chemistry): Quizzes

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Molar Mass
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What is the unit of molar mass?

gmol1\text{g} \cdot \text{mol}^{-1}

Oxygen has Ar=16.0A_r = 16.0. What is its molar mass?

16.0 gmol116.0 \text{ g} \cdot \text{mol}^{-1}

What is the molar mass of H2O\text{H}_2\text{O}? (ArA_r: H=1.0, O=16.0)

18.0 gmol118.0 \text{ g} \cdot \text{mol}^{-1}

What is MM of CO2\text{CO}_2? (ArA_r: C=12.0, O=16.0)

44.0 gmol144.0 \text{ g} \cdot \text{mol}^{-1}

How many oxygen atoms are in Mg(NO3)2\text{Mg(NO}_3\text{)}_2?

6

Calculate moles in 250 g of NaCl (MM = 58.5 gmol1\text{g} \cdot \text{mol}^{-1})

4.27 mol4.27 \text{ mol}

Find mass of 0.50 mol CO2_2 (MM = 44.0 gmol1\text{g} \cdot \text{mol}^{-1})

22 g22 \text{ g}

What is Avogadro's constant NAN_A?

6.02×1023 mol16.02 \times 10^{23} \text{ mol}^{-1}

How many molecules in 22 g CO2_2? (MM = 44.0 gmol1\text{g} \cdot \text{mol}^{-1})

3.0×10233.0 \times 10^{23}

What is MM of pentyl ethanoate C7H14O2\text{C}_7\text{H}_{14}\text{O}_2? (ArA_r: C=12, H=1, O=16)

130.0 gmol1130.0 \text{ g} \cdot \text{mol}^{-1}

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