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A sample of Se weighs 20.5 grams will a sample of V that contains the same number of atoms weigh more or less than 20.5 grams?
JoseCabada
A sample of Se weighs 20.5 grams. Will a sample of V that contains the same number of atoms weigh more or less than 20.5 grams? (more, less): _______
Calculate the mass of a sample of V that contains the same number of atoms. _______ grams of V
Answer:
Since the atomic weight of V is smaller than the atomic weight of Se, each atom will have a smallermass, and the sample will weigh less.
Since the same number of moles will contain the same number of atoms, regardless of the element, it is only necessary to find the number of moles of Se in the 20.5 gram sample, and then to find the mass of the same number of moles of V.
The atomic weight of Se is 79.0 g/mol
1. Convert grams of Se to moles of Se:
moles Se= 20.5 g Se1 mol = 0.260 mol Se79.0 g
Multiply by moles per gram. Grams cancel out.
The atomic weight of V is 50.9 g/mol
2. To convert 0.260 moles of V to grams of V:
grams V = 0.260 mol V50.9 g = 13.2 g V1 mol
Multiply by grams per mole. Moles cancel out.
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