Question

# 18.72 g of a substance 'X' occupies 1.81 $$cm^3$$. What will be its density measured in correct significant figures?

A
10.3 g cm3
B
10.34 g cm3
C
10.4 g cm3
D
10.3425 g cm3

Solution

## The correct option is A 10.3 g $$cm^{-3}$$Density is mass per unit volume of the substance$$Density,\ \rho =\dfrac { mass\ (m) }{ Volume\ (V) }$$Given :$$m=18.72\ g$$ and $$V=1.81\ cm^{3}$$on substituting we get:$$\rho =\dfrac { 18.72 }{ 1.81 } =10.3425$$Rule: Answer to a multiplication or division should be rounded off to the same number of significant figures as possessed by the least precise term in the calculation.least precise is $$1.81$$ with 3 significant figures thus, the answer will also posses 3 significant figures as $$10.3\ g\ cm^{-3}$$ Hence, the correct option is $$A$$Chemistry

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