D. CuCl2 copper(2)chloride
An emerald can be described as a precious gemstone that is commonly green. However, emeralds can be other colors. Emerald commonly describes a color, such as emerald green eyes.
B. sounds like the most reasonable answer.
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Sn + 2Cl2 ------> SnCl4
from reaction 2 mol 1 mol
from the problem 2.85 mol x mol
x=2.85*1/2≈1.43 mol SnCl4
False. The number of neutrons can be more or less than the number of protons.