Final answer:
To convert 4.2 moles of Ca(NO3) to grams, you need to use the molar mass of the compound Ca(NO3)2. The molar mass of Ca(NO3)2 is 164.10 g/mol, so you multiply the number of moles by the molar mass to get the mass in grams.
Step-by-step explanation:
To convert moles to grams, you need to use the molar mass of the compound. In this case, the compound is Ca(NO3)2. The molar mass of Ca(NO3)2 is 164.10 g/mol, which is calculated by adding the molar masses of each atom in the compound.
Next, you multiply the number of moles (4.2 moles) by the molar mass (164.10 g/mol) to get the mass in grams.
4.2 moles Ca(NO3)2 × 164.10 g/mol = 688.62 grams of Ca(NO3)2