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7 May, 13:17

A 10.0-gram sample of which element has the smallest volume at STP?

(1) aluminum (3) titanium

(2) magnesium (4) zinc

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  1. 7 May, 14:22
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    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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