Prove that 4.8 g of magnesium contains the same number of atoms as 13.0 g of zinc. [Relative atomic mass: Mg = 24, Zn = 65; Avogadro constant = 6.02 x 10²³ mol-¹ ]
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Answer:
How many moles of potassium (K) atoms are in 3.04 grams of pure potassium metal?
Solution
In this example, multiply the mass of K by the conversion factor (inverse molar mass of potassium):
1molK39.10gramsK
39.10 grams is the molar mass of one mole of K; cancel out grams, leaving the moles of K:
3.04gK⎛⎝1molK39.10gK⎞⎠=0.0778molK
Similarly, if the moles of a substance are known, the number grams in the substance can be determined. Converting moles of a substance to grams requires a conversion factor of molar mass of substance/one mole of substance. One simply needs to follow the same method but in the opposite direction.
Explanation:
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