quesrion from mole concept class 11
Attachments:
Answers
Answered by
0
Answer:
9) 750 ml of 0.5 M HCl have 0.375 moles.
250 ml of 2 M HCl have 0.5 moles.
Total moles =0.875moles
Total volume =750+250=1000ml=1L
Molarity = moles/Volume
. = 0.875/1
=0.875M
10.A 5.2 molal aqueous solution of methyl alcohol means that 1 kg ( or 1000 g) of water contains 5.2 moles of methyl alcohol. The molecular weight of water is 18 g/mol.
The number of moles of water
= 1000g/18 g/mol
= 55.56 mol
The mole fraction of methyl alcohol =
5.2 mol /5.2mol+55.56mol
=0.086 .
Similar questions