What is the mass of 4.32 mol gai3? 455 g 1,230 g 1,720 g 1,950 g

Answer is: the mass of gallium iodide (GaI₃) is 1,950g.

n(GaI₃) = 4.32 mol; amount of the galium iodide.

M(GaI₃) = Ar(Ga) + 3 · Ar(I) · g/mol.

M(GaI₃) = 69.72 + 3 · 126.9 · g/mol.

M(GaI₃) = 69.72 + 380.7 · g/mol.

M(GaI₃) = 450.42 g/mol; molar mass of gallium iodide.

m(GaI₃) = n(GaI₃) · M(GaI₃).

m(GaI₃) = 4.32 mol · 450.42 g/mol.

m(GaI₃) = 1946 g; mass of gallium iodide.

What is the mass of 4.32 mol GaI3?

455 g

1,230 g

1,720 g

1,950 g CORRECT ANSWER

I took the test and D) was correct

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.

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