Recall that mass percent is given by:
Recall that the mass percentages of a compound must add up to 100%.
%V + %O = 100%
%O = 100% – 68% = 32% O
Assuming we have 100 g of the compound, this means we have 68 g V and 32 g O.
Now, we need to get the moles of each element in the compound.
The atomic masses are 50.94 g/mol V and 16.00 g/mol O.
= 1.33 mol V
= 2.00 mol O
Divide the number of moles of each by the smallest value.
Vanadium forms four different oxides in which the percent by mass of vanadium is respectively 76%, 68%, 61%, and 56%.
Give the name of the second oxide.
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