To determine the number of chlorine atoms from the given amount of chloral hydrate, first, we need to know the formula and the molar mass of this compound. Chloral hydrate has a chemical formula C2H3Cl3O2 and a molar mass of 165.4 g/mol. Then, we convert the mass of the compound to moles by the molar mass. Next, we calculate for the amount in moles of Cl in the compound. Lastly, we use Avogadro's number to determine the number of chlorine atoms in the compound. We calculate as follows:
5.0 g C2H3Cl3O2 ( 1 mol C2H3Cl3O2 / 165.4 g C2H3Cl3O2) ( 35.46x10^2 mol Cl / 1 mol C2H3Cl3O2 ) ( 6.022 x10^23 Cl atoms / 1 mol Cl ) = 5.46 x 10^22 atoms of Cl
