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Molarity from the mass of solute and the volume of solution (or the reverse)

This type of question, asked 9 times: 2021 Paper 13, 2021 Paper 19, 2021 Paper 22, 2021 Paper 23, 2021 Paper 24, 2021 Paper 26, 27 Jan 2024, 30 Jan 2024, 4 Apr 2024. All 9 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2021 Paper 13

    41
    If concentration of glucose (C6H12O6)\left( C_{6}H_{12}O_{6} \right) in blood is 0.72 g/L0.72\text{ }g/L. Its molarity is:

  2. Question 2

    2021 Paper 19

    56
     100 mL\ 100\text{ }mL of Na3PO4Na_{3}PO_{4} solution contains 3.45 g3.45\text{ }g of sodium. The molarity of the solution is ×10−2\times10^{- 2} mol L  −1\ ^{- 1}. (Nearest integer) [Atomic Masses - Na : 23.0 u, O : 16.0 u, P : 31.0 u]

  3. Question 3

    2021 Paper 22

    52
    The molarity of the solution prepared by dissolving 6.3 g6.3\text{ }g of oxalic acid (H2C2O4⋅2H2O)\left( H_{2}C_{2}O_{4}\cdot 2H_{2}O \right) in 250 mL250\text{ }mL of water in molL−1molL^{- 1} is x×10−2x \times10^{- 2}. The value of xx is (Nearest integer) [Atomic mass: H:1.0,C:12.0,O:16.0H:1.0,C:12.0,O:16.0 ]

  4. Question 4

    2021 Paper 23

    58
    Sodium oxide reacts with water to produce sodium hydroxide. 20.0 g20.0\text{ }g of sodium oxide is dissolved in 500 mL500\text{ }mL of water. Neglecting the change in volume, the concentration of the resulting NaOHNaOH solution is ×10−1\times10^{- 1} M. (Nearest integer) [Atomic mass: Na=23.0,O=16.0,H=1.0]Na = 23.0,O = 16.0,H = 1.0\rbrack

  5. Question 5

    2021 Paper 24

    56
    If 80 g80\text{ }g of copper sulphate CuSO4⋅5H2OCuSO_{4}\cdot 5H_{2}O is dissolved in deionised water to make 5 L5\text{ }L of solution. The concentration of the copper sulphate solution is x×10−3 mol L−1x \times 10^{- 3}\text{ }mol{\text{ }L}^{- 1}. The value of xx is [Atomic masses Cu: 63.54u,S:32u,O:16u,H:1u63.54u,S:32u,O:16u,H:1u ]

  6. Question 6

    2021 Paper 26

    51
    The NaNO3NaNO_{3} weighed out to make 50 mL50\text{ }mL of an aqueous solution containing 70.0 mg Na+70.0\ mg\ Na^{+} per mLmL is ______ gg. (Rounded off to the nearest integer) [Given: Atomic weight in g mol−1g\ mol^{-1}. Na:23;N:14;O:16Na:23; N:14; O:16]

  7. Question 7

    27 Jan 2024

    146
    Volume of 3MNaOH3MNaOH (formula weight 40 g mol−140\text{ }g{\text{ }mol}^{- 1} ) which can be prepared from 84 g84\text{ }g of NaOHNaOH is _____ ×10−1dm3\times10^{- 1}dm^{3}.

  8. Question 8

    30 Jan 2024

    60
    The mass of sodium acetate (CH3COONa)\left( CH_{3}COONa \right) required to prepare 250 mL250\text{ }mL of 0.35M0.35M aqueous solution is _____ g. (Molar mass of CH3COONaCH_{3}COONa is 82.02 g mol−182.02\text{ }g{\text{ }mol}^{- 1} )

  9. Question 9

    4 Apr 2024

    48
    The Molarity (M) of an aqueous solution containing 5.85 g5.85\text{ }g of NaClNaCl in 500 mL500\text{ }mL water is: (Given: Molar Mass Na:23Na:23 and Cl:35.5 g mol−1Cl:35.5\text{ }g\text{ }mol^{- 1} )

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