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The density of the solution is 2.15 g mL$^{-1}$, then mass of 2.5 mL solution in correct significant figures is:
Detailed Solution
In multiplication and division, the result has as many significant figures as the quantity with the least number of significant figures. Mass $=2.15\times2.5=5.375$ g $\approx5.4$ g (2 significant figures).