1. Calculate the number of moles in 5.72 x 10^20 molecules of CO

2. Calculate the number of atoms in 1.20 moles of sulfur

3. Calculate the molar mass of Al2(SO4)3

Calculate in the mass in grams of 3.00 moles Ca

Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We do as follows:

5.72 g ( 1 mol / 180.16 g ) (  6.022 x 10^23 molecules / mole ) = 1.90x10^23 molecules

Explanation:

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

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tony (lordcaos066)