Which calculation correctly determines the formula unit mass of CaCl2?

Question

Which calculation correctly determines the formula unit mass of CaCl2? — Exam MCQ

rrbjepyq.in · Accepted Answer

D. Atomic mass of Ca + (2 x atomic mass of Cl) = 40 + 71 = 111 u — The formula unit mass of CaCl2 is determined by adding the atomic mass of Ca to twice the atomic mass of Cl. The formula unit mass of an ionic compound is calculated by multiplying each atomic mass by its subscript. In CaCl2, there is one calcium atom and two chlorine atoms leading to the calculation: 40 + (2 x 35.5) = 40 + 71 = 111 u.

rrbjepyq.in · Answer

A. Atomic mass of Ca + (atomic mass of Cl ÷ 2) = 40 + 17.75 = 57.75 u

rrbjepyq.in · Answer

B. Atomic mass of Ca x atomic mass of Cl = 40 x 35.5 = 1420 u

rrbjepyq.in · Answer

C. Atomic mass of Ca + atomic mass of Cl = 40 + 35.5 = 75.5 u

Which calculation correctly determines the formula unit mass of CaCl2?

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