Answered

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A 10.0-gram sample of which element has the smallest volume at STP?
(1) aluminum (3) titanium
(2) magnesium (4) zinc

Sagot :

Since all of these elements are under the same conditions, volume only varies based on the number of atoms present. You can find the number of atoms in a given sample by dividing the weight of the sample by the molar mass.

Aluminum has a molar mass of 26.9 so 10/26.9 = .371 moles

go on to get Ti= 10 /  47.88 =.209 moles

Mg = 10.0 / 24.3 = 0.412 moles

Zn = 10 / 65.37 = .153 moles

Since there are less moles of Zn, it has the smaller volume at STP than the other elements.
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