3 years ago

A pure substance composed of two or more different elements is aln)

Chemistry

1 answer:

kenny6666 [7]3 years ago

8 0

Answer:

Explanation:

that is my dads answer

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What change occurs every time elements form a compound?

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An element A has an atomic number of 11 and another element B has an atomic number 17 (A

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3 years ago

A chemist wishes to prepare a stock solution of 1.25 M KI. She will be diluting a 3.25 M KI solution in order to obtain 0.355 L

strojnjashka [21]

0.137 L of the stock solution

M1V1 = M2V2
M1 = 3.25 M
V1 = This is what we’re solving for.
M2 = 1.25 M
V2 = 0.355 L

Solve for V1 —> V1 = M2V2/M1

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3 years ago

How many grams of O2 gas are in a 3700 mL container at a pressure of 775 mmHg at 33oC?

Zina [86]

Answer:

4.8 grams

Explanation:

Use PV=nRT

P: 775 mmHg (divide by 760 mmHg to get atm) -> 1.02 atm

V: 3700 mL (divide by 1000 to get L) -> 3.7L

n: ?

R: (a constant) 0.0821L * atm/k *mol

T: 33 C (add 273 to get K) -> 306K

Move equation so n is on the side: PV/RT = n. Plug the numbers into the equation.

$\frac{1.02atm * 3.7L }{306K} * \frac{K * mol}{0.0821L *atm} = 0.15 mol$

Then, convert moles to grams using the molar mass of O2 which is 32g/mol.

$0.15 mol * \frac{32g}{mol}$ = 4.8g

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The answer is El NIÑO'
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