4.5 g of compound A (MW = 90) was used to make 250 mL of its aqueous solution.
Question:

4.5 g of compound A (MW = 90) was used to make 250 mL of its aqueous solution. The molarity of the solution in M is x × 10–1. The value of x is ________. (Rounded off to the nearest integer)

Solution:

$\mathrm{M}=\frac{4.5 / 90}{250 / 1000}=0.2$

$=2 \times 10^{-1}$

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