Is my answer right about this question?

Question

The concentration of stomach acid, HCL, is approximately 0.10 M. What volume of stomach acid contains 0.25 mg HCL?
My answer is 0.000192 L
Is it right?Help pls.

Answer 1

x L HCl = .25mg (1 g/1000 mg)(1 mole HCl/36.46 g)(1 L/.1 mole HCl)

I get 6.86 times ten to the -5.

Answer 2

Well, the previous answers were both correct and complete; all I could add would be some more words to make sure that the explanations make sense (which is probably not necessary, but just in case):
First, let’s check your answer:
HCl has a formula weight of 36.46 (atomic weight of H is 1, and the atomic weight of Cl is 35.46), so a 1M solution would be 36.46 g/ L.
You’re working with a 0.1M solution, so the amount is 3.646 g/L
0.000192 L * 3.646 g/L = 0.00070 g = 0.7 mg.
Hmm; that’s not 0.25 mg – let’s see what went wrong.
If you want to figure out what volume at that molarity would contain 0.25 mg, you’d set up an equation:
3.646 g/L = 0.25 mg/N L, where N is the volume you’re trying to determine.
Setting the measurements the same makes the equation:
3,646 mg/L = 0.25 mg/N L.
Now we solve for N:
N L * (3,646 mg/L) = 0.25 mg
N L * (1/L) = 0.25 mg/3,646 mg
N = 0.25/3,646 = 0.0000686 L (=0.0686 mL = 68.6 microliters).
Now, let’s check by multiplying back:
.0000686 L * 3.646 g/L = .00025 g = .25 mg

Answer 3

It's HCl not HCL for the record.


.25 mg x (1 g / 1000 mg) x (1 mole / 36.45 g) x ( 1 L / 0.10 moles)

= (0.25 / (1000 x 36.45 x .1)) L = (.25 / 3645) L = 0.0000686 L

= 6.86 x 10^-5 L

give that you have only two sig figs, you should report it as...

6.9 x 10^-5 L

Answer 4

.25 mg = 2.5 x 10^-4 g
molar mass= GFM = 36.36 g/mol for HCl
mol = mass / GFM
mol = 2.5 x 10^-4 g / 36.36 g/ mol
mol = 6.88 x 10^-6 mol

Molarity is moles of solute divided by liters of solution
.10 M = 6.88 x 10^-6 mol / x
x = 6.88 x 10^-5 L

Answer 5

well to find the molarity of something you will use this equation:

M = moles/liter

so if you have .25 mg or 2500 g
then .1M=69.4moles x L
solve for L

Answer 6

0.1M=0.1moles/L
M.W. of HCl is ~36g/mole
0.1moles/L x 36g/mole= 3.6g/L
0.00025g x (1L/3.6g) = 0.0000694L