Question

The mass of an unidentified metal sphere is 133 grams. Students determine the

Answer 1

Given the data from the question, the identity of the unknown metal having a of mass 133 g is Cobalt

What is density?

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

How to determine the density

• Mass = 133 g
• Volume of water = 25 mL
• Volume of water + metal = 40 mL
• Vol of metal = 40 – 25 = 15 mL

• Density =?

Density = mass / volume

Density = 133 / 15

Density = 8.86 g/mL

Comparing the density of the unknown metal (i.e 8.86 g/mL) with those given in the chart in the question above, we can conclude that the unknown metal is Cobalt

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