Question

]What is the molarity of a 0.25-liter solution containing 52 grams of HBr?

13 M HBr

2.6 M HBr

0.64 M HBr

0.16 M HBr

Answer 1

Molarity = mol per liter
First calculate how many mol HBr = 52 gram

To do this, you need to find the molar mass of hydrogen bromide, and divide 52 with it.
Then you'll know how many moles HBr you have
If it were 1 liter, you'd had the molarity, but in this case the vollume is 0.25 liter
So you have to divide it by 4 to get the molarity.

Answer 2

thank you so much! Hate online schooling it's ever explained well

Answer 3

So did you get the answer?

Answer 4

yeah it says .38 but that's none of the answers..

Answer 5

Let me check

Answer 6

What is the molar mass of HBr?

Answer 7

80.912

Answer 8

That's correct.

\(\large \dfrac{52}{80.912}=0.643\ mol\)

What do you get when you divide that by 4?

Answer 9

2.6

Answer 10

thanks(:

Answer 11

No you multiplied it.

Answer 12

How can 0.643 divided by 4 be 2.6?

Answer 13

hdjbab wait hold on

Answer 14

i divided .643 by .25 and it says 2.572 so..

Answer 15

that's one of the answers so should I go with that?

Answer 16

The molarity is in mol per liter
since you have 1/4th part of a liter (0.25) you should divide it by 4, not 0.25
because 1/4 = 0.25

Answer 17

\(\large\sf\dfrac{0.643}{4}=?\)

Answer 18

.16

Answer 19

my bad

Answer 20

Haha no problem, you only learn from these little mistakes :)

Answer 21

lol yup! thanks I'm probably gonna need help with another problem in a sec this is pretty difficult

Answer 22

Sure i can help you with any of these kinda questions :)

Answer 23

A sample of gas has a pressure of 3.2 atmospheres at a temperature of 301 Kelvin. What would be the pressure of the same sample of gas when the temperature is decreased to 285 Kelvin? Show all of the work used to solve this problem.

Answer 24

lol like this one.

Answer 25

It's best to close this question and start a new one with that question :)

Answer 26

oh ok

Answer 27

otherwise the post can get really long and confusing