Cell bio math practice questions

3 L of a 2 M sugar solution — how many moles of sugar?

6 moles

4 g sugar (M.W. 342 g/mol) dissolved in 350 mL water — molarity?

0.033 M

171 g sucrose (M.W. ≈ 342 g/mol) in 1.00 L solution — molarity?

0.5 M

0.75 mole dissolved in 2.50 L — molarity? →

0.3 M

25.0 g KBr (M.W. 119 g/mol) in 750.0 mL — molarity? →

0.28

58.44 g NaCl (M.W. 58.44 g/mol) in 2.00 L — molarity?

0.5 M

80.0 g glucose (M.W. 180 g/mol) in 1.00 L — molarity? →

0.444 M

15.0 g H₂SO₄ (M.W. 98 g/mol) to make a 0.200 M solution — how many mL? →

765.3 mL

30.0 g acetic acid (M.W. 60 g/mol) in 500.0 mL — molarity? →

1.0 M

Formula:

M = moles of solute ÷ liters of solution

moles = grams ÷ molecular weight)