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

mass = volume x density

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

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

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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.

.698

To find the mass of a substance, we can follow a simple equation: Mass = Density x Volume.

In this case, the given density is 0.930 g/mL, and the volume is 750 mL. The density gives us the mass of the substance per unit volume, so multiplying the density by the volume will give us the mass.

First, we need to convert mL to L, since the density is given in grams per milliliter. There are 1000 mL in a liter, so 750 mL is equal to 0.75 L.

Now, we can plug the values into the equation: Mass = 0.930 g/mL x 0.75 L.

Multiplying these numbers gives us: Mass = 0.6975 g.

Therefore, the mass of the substance is 0.6975 grams or 697.5 kilograms (since there are 1000 grams in a kilogram).