What is the mass of 3.10 moles of magnesium chloride, MgCL2?

The mass of 3, 10 moles of MgCl2 is 295, 43 grams.

Explanation:

We calculate the weight of 1 mol of MgCl2:

Weight 1mol of MgCl2= weight Mg + (weight Cl)x  2=

24, 3 grams + 2 x 35, 5 grams = 95, 3 grams/mol MgCl2

1 mol MgCl2  95, 3 grams

3,1 mol MgCl2x=(3,1 mol MgCl2x95,3 grams)/1 mol MgCl2

x=295, 43 grams

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.