What is the molarity of solution prepared by mixing 5.85g of NaCl in distilled water to obtain a final volume of 250ml?

Question

adamconner · Answer

Molarity= moles of solute/liters of solution

adamconner · Answer

do you know how to go from grams to moles?

anonymous · Answer

yes ifind  the grams for nacl first right?

adamconner · Answer

yes

adamconner · Answer

i mean you find the moles. you have the grams

anonymous · Answer

k i got 49.5

anonymous · Answer

mol

adamconner · Answer

how did you get that? moles= grams/molar mass.

so you have 5.85g NaCl and the molar mass for NaCl=58.45

anonymous · Answer

ok i found sodium chloride and add it up and got 49.5 iadded their mass numbers

adamconner · Answer

the molar mass of NaCl is molar mass of Na + molar mass of Cl
so MM of Na=22.9 and Cl=35.35
22.9+35.45=58.35

anonymous · Answer

ohhhhhhh i c what i did wrong i accidetly used nitrogen thats y

adamconner · Answer

oh my bad MM for Cl is 35.45

anonymous · Answer

k i got 58.5

adamconner · Answer

ooh yea that makes a lot of difference

anonymous · Answer

then is it 58.5/250?

adamconner · Answer

no, you have 250ml so you need to change that to Liters

adamconner · Answer

so you would divide 250/1000

anonymous · Answer

oh how can i tell when i have to change it to litres if i have a question like this

adamconner · Answer

well the formula for molarity is molarity=Moles of solute/Liters

adamconner · Answer

in the question it gives you milliliters but in the equation you need liters

anonymous · Answer

ohh ok i c

adamconner · Answer

so what would your equation look like now?

anonymous · Answer

58.5/0.25

anonymous · Answer

molarity of 234

adamconner · Answer

ooh my bad, we forgot to change to moles

adamconner · Answer

to find moles you divide grams(given in question)/MM which is 58.35

so that way you will have 5.85/58.35

anonymous · Answer

=0.1002

anonymous · Answer

0.1

adamconner · Answer

yes

now you go back to the molarity question and plug that in 

so you have molarity=.1002/.25

anonymous · Answer

0.4

adamconner · Answer

yep you got it!

anonymous · Answer

thanks alot for your help greatly appreciated.r u familiar with stoi chemistry?

adamconner · Answer

my pleasure. kinda. i can try, jus post it in a different question so if i can't help then someone else might be able to

anonymous · Answer

k thanks alot

adamconner · Answer

your welcome