Question

A student has a 5. 00 gram sample of calcium chloride (cacl2) solid. How many moles of calcium chloride are contained in this sample?

Answer 1

0.0451 moles ≅ 0.04 moles

Step-by-step explanation:

We are able to calculate how many moles of calcium chloride (CaCl₂) are in 5.00 g sample, by dividing the mass into the molar mass (MM) of the compound:moles = mass/MMFirst, we calculate MM of CaCl₂ from the chemical formula, using the molar mass of the elements Ca and Cl:MM CaCl₂ = (1 x MMCa) + (2 x MMCl) = 40 g/mol + ( 2 x 35.453 g/mol) = 110.9 g/mol.

Finally, we calculate the moles from the mass and MM:moles of CaCl₂ = mass/(MM CaCl₂) = 5.00 g/(110.9 g/mol) = 0.0451 moles ≅ 0.04 moles

So your answer comes out as 0.0451 moles ≅ 0.04 moles.

Hope this helped :)