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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.

How much cm is 2 X 3.5 inches?

5.08 x 8.89 cm

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

Volume = 1.53 cc = 3.375 cc. Surface area = 6*1.52 cm = 13.5 cm2 So surface area to volume ratio = 3.375 cm3/13.5cm2 = 0.25 [cm]. Note that the ratio depends on the unit