1. 30.0 ml of ethyl alcohol(density=0.790g/ml)are added to a graduated cylinder that weighs 44.28 grams. what will be the mass of the graduated cylinder plus the alcohol(in grams)?

Density = mass/volume

mass = volume * density
volume = mass/density

You were given both the volume and density of ethyl alcohol, and you're looking for the amount the mass of ethyl alcohol added to the graduated cylinder. So, plug in the numbers for mass:

30mL * 0.790g/mL = 23.7g ethyl alcohol
23.7g ethyl alcohol + 44.28g graduated cylinder = 67.98g

To find the total mass of the graduated cylinder plus the alcohol, we need to consider the mass of the empty graduated cylinder as well as the mass of the ethyl alcohol.

The given density of ethyl alcohol is 0.790 g/ml, and the volume of the alcohol added is 30.0 ml. So, we can calculate the mass of the alcohol as follows:

Mass of ethyl alcohol = Density x Volume
= 0.790 g/ml x 30.0 ml
= 23.7 grams

Now, to find the total mass, we need to add the mass of the graduated cylinder to the mass of the alcohol.

Given that the mass of the empty graduated cylinder is 44.28 grams, we can calculate the total mass as follows:

Total mass = Mass of graduated cylinder + Mass of ethyl alcohol
= 44.28 grams + 23.7 grams
= 67.98 grams

Therefore, the mass of the graduated cylinder plus the ethyl alcohol is 67.98 grams.