Question

how many cl-1 ions in 28.9 gram of zncl2?
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Answer 1

Answer:

as zncl2 molar mass is 136.28 { 1 mole }

so for x mole, 28.9 gram is the mass

so the mole is 0.2 mole; as x = 28.9 ÷ 136.28

as for 1 mole, there are two ions of cl-

so total number of ions for 1 mole is 2 × 6.022 × 10²³

so for 0.2 mole is 0.2 × 2 × 6.022 × 10²³

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