Question

What mass of CaCl2 would you need to have 0.43 moles of CaCl2?

Answer 1

To determine the mass of CaCl2 we need, we must first calculate what the molar mass of the molecule is. To find the molar mass of a molecule, we add the atomic weights of the elements multiplied by the number of atoms of each element. To see it a little clearer we can make the following table:

The molar mass of the CaCl2 molecule is 110.984 g/mol. They give us the number of moles and ask us to find the mass, we apply the following equation to find the mass of CaCl2:

`\begin{gathered} gC_{}aC_{}l_2=GivenmolCaCl_2*(MolarMass,gCaCl_2)/(1molCaCl_2) \\ gC_{}aC_{}l_2=0.43molCaCl_2*(110.984gCaCl_2)/(1molCaCl_2)=48gCaCl_2 \end{gathered}`

To have 0.43 moles of CaCl2 would need 48gCaCl2