Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

Ans: 0.0303 moles of iron are made in the sample

Given:

Mass of iron = 1.69 g

To determine:

moles of iron in the sample

Explanation:

Moles of iron = mass of iron/atomic mass

                      = 1.69 g/55.85 g.mol-1 = 0.0303 moles

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

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