Ncert Exercises & Solutions

If the density of the solution is 3.12 g ml^-1, then what will be the mass of the 1.5 ml solution in two significant figures?

1.	$4.4~\mathrm{g}$	2.	$4680 \times 10^{3} ~\mathrm{g}$
3.	$4.7~\mathrm{g}$	4.	$46.80~\mathrm{g}$

Hint: Density = $amount$ $of$ $substance volume$ $of$ $solution$

Calculate the mass of the solution

amount of substance = density x volume of solution

In these operations, the result must be reported with no more significant figures as in the measurement with the few significant figures. Hence, answer will contains two significant figure

amount of substance = 3.12 x 1.5

= 4.7 g

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1.	\(4.4~\mathrm{g}\)	2.	\(4680 \times 10^{3} ~\mathrm{g}\)
3.	\(4.7~\mathrm{g}\)	4.	\(46.80~\mathrm{g}\)