What is the mass of a magnesium block that measures 2.5 cm x 3.5 cm x 1.5 cm?

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You need to know the density o f Mg
D = Mass/Volume

Mass = Density * volume

Density= 1.74 grams per cubic centimeter
Volume = 2.5 * 3.5 * 1.5

Mass = Density * volume
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What is the sq cm of 4 x 2 x 1.5 cm?

You've given three figures here which makes me think that they are the sides of a three dimensional figure. But you've asked for the square centimetres. This is not possible.

What is the surface area to volume ratio in 1.5 cm x 1.5 cm x 1.5 cm?

Volume = 1.5 3 cc = 3.375 cc. Surface area = 6*1.5 2 cm = 13.5 cm 2 So surface area to volume ratio = 3.375 cm 3 /13.5cm 2 = 0.25 [cm]. Note that the ratio depends