Suppose we have 100 g of each of the following substances. Which sample contain the greatest number of moles (F. W. = Formula Weight) A. HCI, F. W. = 36.5 B. H_2O, F. W. = 18.0 C. MgCO_3 F. W. = 84.3 D. AlCI_3, F. W. = 133.3 E. NaCl, F. W. = 58.4

100 g of water has the highest number of moles

Explanation:

Recall that the number of moles is obtained as given mass/formula weight

For HCl;

number of moles = 100g/36.5g/mol = 2.7 moles

For H2O;

number of moles = 100g/18g/mol = 5.5 moles

For MgCO3

number of moles = 100g/84.3 g/mol = 1.2 moles

For AlCl3

number of moles = 100g/133.3g/mol = 0.75 moles

For NaCl

number of moles = 100g/58.4 g/mol = 1.7 moles

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error