Question

1. Whats the molality of a solution of 2.0g of NaCl dissolved in 1.0 kg of water?

2. If a sample of gas occupies a volume of 100 mL at a pressure of 200 mm Hg at at constant temperature and the pressure is changed to 400 mm Hg, the volume will change to?

Answer 1

@eric_d Know these?

Answer 2

Hello @KissesFromKristine !

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Answer 3

what do u think @Abhisar

Answer 4

\[Molality = \frac{ No. of moles of solute }{ Mass of solvent \in Kg }\]

Answer 5

So, molality of 2 g NaCl in 1 kg of water will be 0.034

Answer 6

are u getting guys ?

Answer 7

how do u et 0.034

Answer 8

get*

Answer 9

@Abhisar

Answer 10

so I got to convert 2g to mole first

Answer 11

Thanks for the help @Abhisar, I ended up figuring that one out though. :P

Know how to do the second one?

Answer 12

okay... 58.5 g NaCl = 1 mole then 2g will contain how many moles ?
@eric_d

Answer 13

yes @KissesFromKristine for the second one the answer will be 50 ml btw what's the answer for 1st one ?

Answer 14

For the second one u can use the formula \[\frac{ P1 }{ P2 } = \frac{ V2 }{ V1 }\]

Answer 15

The first one is what you said: 0.034

Answer 16

okay...u got the second one ?

Answer 17

U can derive the formula i said from the equation PV=nRT

Answer 18

Yep, makes sense when you put up the formula, I forgot about that.

Answer 19

you're really good at chem, thanks for all the help! :) <3

Answer 20

I got it
@Abhisar
Thanks for the explanation

Answer 21

\(\Huge\text{Anytime !}\)
\(\huge\ddot\smile\)