volume to mL and total mass to grams

Question

An empty beaker weighs 39.65 g.

When completely filled with water, the beaker and its contents have a total mass of 420.85 g. What volume does the beaker hold? Use 𝑑=1.00 g/mL as the density of water.

volume: ? mL

How much would the beaker and its contents weigh if it was completely filled with mercury? The density of mercury is 𝑑=13.5 g/mL.

total mass: ? g

Answer 1

Hi Kylie, I can help out with this one.

The mass of water is 420.85 g - 39.65 g = 381.20 g

1) For the first question, at a density of 1g/mL, this mass corresponds to a volume of 381.20 mL.

2) The mass of 381.20 mL of Hg = 381.20 mL*13.5g/mL = 5145.2 g. Next, let's add the weight of the beaker:

5145.2 g + 39.65 g = 5184.85 g

The answer to the first question is 381.20 mL. The answer to the second question is 5184.85 g.

All the best and let me know if you have any questions.