30 March, 15:47
What mass of solute is contained in 25.4 ml of a 1.56 m potassium bromide solution?
30 March, 16:29
Answer is: mass of potassium bromide is 4.71 grams.
V (KBr) = 25.4 mL : 1000 mL/L = 0.0254 L, volume of solution.
c (KBr) = 1.56 mol/L.
n (KBr) = c (KBr) · V (KBr).
n (KBr) = 1.56 mol/L 0.054 L.
n (KBr) = 0.0396 mol, amount of substance.
m (KBr) = n (KBr) · M (KBr).
m (KBr) = 0.0396 mol · 119 g/mol.
m (KBr) = 4.71 g.
M - molar mass.
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