Establish the rules in significant figures and calculate the mass of liquid using weigh by difference then determine the density per g/mL

In order to determine the density of the liquid, we have to calculate for the mass of the liquid:

$\overline{){\mathbf{density}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{mass}}{\mathbf{volume}}}$

$\overline{){\mathbf{mass}}{\mathbf{}}{\mathbf{of}}{\mathbf{}}{\mathbf{liquid}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}{\mathbf{mass}}{\mathbf{}}{\mathbf{of}}{\mathbf{}}{\mathbf{beaker}}{\mathbf{+}}{\mathbf{liquid}}{\mathbf{}}{\mathbf{-}}{\mathbf{}}{\mathbf{mass}}{\mathbf{}}{\mathbf{of}}{\mathbf{}}{\mathbf{beaker}}}$

Remember the rules for the significant figures in calculations.

A flask containing 7.50 mL of a liquid weighs 168.1 g with the liquid in the flask and 160.1 g when empty.

Calculate the density of the liquid in g/mL to the correct number of significant digits.

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