mercury has density of 13.53 g/mL. what is the mass of 345mL of mercury?

D=13.53g/mL
Mass=345mL
13.53/345=0.039217391

i just do not think i am doing this right

I agree, you are not doing it right. Look at the units:

mass, you have chosen volume ml.

Density=13g/ml you can do it more precise
volume=345 ml

basic definition
Density=mass/volume
so mass= density*volume
mass= 13g/ml*345ml= xxxx grams

To calculate the mass of 345 mL of mercury, you can use the formula:

Mass = Density × Volume

Given that the density of mercury is 13.53 g/mL and the volume is 345 mL, you can substitute these values into the formula:

Mass = 13.53 g/mL × 345 mL

Now, multiply these two values:

Mass = 4685.85 g

Therefore, the mass of 345 mL of mercury is 4685.85 grams.

To calculate the mass of a substance, you need to multiply its density by its volume. In this case, the density of mercury is given as 13.53 g/mL, and the volume of mercury is 345 mL.

To find the mass, we can use the formula:

Mass = Density × Volume

Substituting the given values:

Mass = 13.53 g/mL × 345 mL

Now, multiply the density and the volume to find the mass:

Mass = 4683.85 g

Therefore, the mass of 345 mL of mercury is 4683.85 grams.