Question

what is the mass in kilograms of 750 mL of a substance that has a density of 0.930 g/mL?

Answer 1

mass = volume x density
mass = 750 mL x 0.930 = ??grams, then convert to kg.

Answer 2

With these types of calculations it is very useful to include units. This tends to stop quite a few simple errors.

So here

mass = 750 mL x 0.930 g/mL

we can see that ml will cancel and we are left with g

which we then convert to kg

Answer 3

gjfsgjfgks

answer is incorrect because:

it is numerically incorrect
it is missing the unit
it is missing the leading zero
it is the incorrect number of significant figures
no working shown

so you need to make sure your answer covers these.

Answer 4

.698