Question

What moles would
I need to dissolve
in 100cm³ to
make 2moldm-³?

Answer 1

To determine the number of moles needed to dissolve in 100 cm³ to make a 2 moldm⁻³ solution, we can use the formula:

Moles = Concentration × Volume

Given:
Concentration = 2 moldm⁻³
Volume = 100 cm³ (which can be converted to dm³ by dividing by 1000)

Converting cm³ to dm³:
100 cm³ ÷ 1000 = 0.1 dm³

Now we can calculate the moles:
Moles = 2 moldm⁻³ × 0.1 dm³ = 0.2 moles

Therefore, you would need to dissolve 0.2 moles of the substance in 100 cm³ to make a 2 moldm⁻³ solution.