mass of sodium?

Question

What mass of sodium (density .968) would have twice the volume of 82.5 gram sulfur (denisty 1.96)?

Thanks so much, in advance. This is a practice sheet I got for I test I'm taking Friday and I have no idea.

:)

Answer 1

You are working with density, which is mass/volume.

82.5 grams of sulfur (density 1.96 g/cm³) would have a volume of:

(82.5 g)/(1.96 g/cm³) = 42.09 cm³

You need twice that volume, or 84.18 cm³ of sodium.

(84.18 cm³)*(density of sodium) = mass of sodium

84.18 cm³ * 0.968 g/cm³ = 81.49 grams