Question

ethanol is a common laboratory solvent and has a density of 0.789 g/mL. what is the mass, in grams, of 151 mL of ethanol

Answer 1

With the density given, you can use to convert volume (mL) to mass (g)_, and vice versa. you can use the density as a conversion factor.

so if the density is 0.780 g/mL, then 0.789 g= 1 mL

now let's use this conversion factor to convert the mL to grams.

$151 mL ( \frac{0.789 grams}{1 mL} )= 119 grams$

Answer 2

V = 151 mL = 151 cm³
d = 0,789 g/mL = 0,789 g/cm³
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d = m/V
m = d×V
m = 0,789×151
m = 119,139g