the density of alcohol is 0.789 g/ ml at 20 degree celcius . calculate the mass of a 30 ml sample?

mass = volume x density. Substitute and solve.

23.67

To calculate the mass of a 30 ml sample of alcohol, you need to use the formula:

Mass = Density × Volume

Given that the density of alcohol is 0.789 g/ml and the volume is 30 ml, you can substitute these values into the formula:

Mass = 0.789 g/ml × 30 ml

Now, multiply the density (0.789 g/ml) by the volume (30 ml):

Mass = 0.789 g/ml × 30 ml = 23.67 g

Therefore, the mass of a 30 ml sample of alcohol is 23.67 grams.