Question detail

Calculate the concentration in mol/dm3 of a solution if 10 grams of solute are dissolved in 2 dm3 of solution. (Molar mass of solute = 50 g/mol)

Try the question, check the answer, then read the explanation to understand the curriculum point.

Show answer Topic hub Objective page

At a glance

MCQ

Type

practice

Style

Topic

Using concentrations of solutions in mol/dm3 (chemistry only) (HT only)

Question

A. 0.1 mol/dm3
B. 0.2 mol/dm3
C. 0.3 mol/dm3
D. 0.4 mol/dm3

Answer

0.1 mol/dm3

Explanation

First, convert mass to moles: moles = mass / molar mass = 10 g / 50 g/mol = 0.2 mol. Then, concentration = moles / volume = 0.2 mol / 2 dm3 = 0.1 mol/dm3.

Common mistake

Common Mistake in Moles Calculation

Students often forget to convert the volume from cm3 to dm3 when calculating moles from concentration.

Always convert the volume to dm3 by dividing cm3 value by 1000 before using it in the calculation.

Related flashcards

Flashcard 1 of 5

Press Space to flip, arrows to move