How much of a substance is contained in a 540 gram silver bar?

First, we find the atomic weight of silver (This can be done according to D.I.Mendeleev’s table): 107
Next, we determine the number of moles:
540/7 = 5 (rounded to the nearest hundredth)
It remains to multiply the number of moles by Avogadro’s number (Na = 6.22 * 10 ^ 23), we get:
7 * 6.22 * 10 * ^ 23 = 3.14 * 10 ^ 22

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