Question

part a a solution is prepared by dissolving 0.69 mol of mgcl2 in 0.40 kg of water. how many moles of ions are present in solution? express your answer to two significant figures and include the appropriate units. n

Answer 1

The moles of ions present in the solution when a solution is prepared by dissolving 0.69 mol of mgcl2 in 0.40 kg of water is 2.0 moles.

0.69 moles of MgCl2 in 0.4 kg water

MgCl2 disassociates as Mg2+ + 2Cl-

So 1 MgCl2 from 3 moles

Moles of ion present is 3x0.69=2.0 moles

• The number of moles is given mass by molecular mass.
• Significant figures are a way of expressing numbers.
• In positional notation, significant figures are the digits in a number that is trustworthy and required to denote the amount of something.

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