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3 years ago

i need help i have a homework assignment to finish and this is the last question help please and thank u

Chemistry

1 answer:

Jet001 [13]3 years ago

5 0

A
i just searched it up and wanted to help

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Use the IUPAC nomenclature rules to give the name for this compound - CrPO4.

MrRissso [65]

Answer:

i need help

Explanation:

7 0

3 years ago

A buffer solution contains 0.240 M ammonium chloride and 0.499 M ammonia. If 0.0565 moles of perchloric acid are added to 250 mL

snow_lady [41]

Answer:

The pH of the resulting solution is 9.02.

Explanation:

The initial pH of the buffer solution can be found using the Henderson-Hasselbalch equation:

$pOH = pKb + log(\frac{[NH_{4}Cl]}{[NH_{3}]})$

$pOH = -log(1.78\cdot 10^{-5}) + log(\frac{0.240}{0.499}) = 4.43$

$pH = 14 - pOH = 14 - 4.43 = 9.57$

Now, the perchloric acid added will react with ammonia:

$n_{NH_{3}} = 0.499moles/L*0.250 L - 0.0565 moles = 0.0683 moles$

Also, the moles of ammonium chloride will increase in the same quantity according to the following reaction:

NH₃ + H₃O⁺ ⇄ NH₄⁺ + H₂O

$n_{NH_{4}Cl} = 0.240 moles/L*0.250L + 0.0565 moles = 0.1165 moles$

Finally, we can calculate the pH of the resulting solution:

$pOH = pKb + log(\frac{[NH_{4}Cl]}{[NH_{3}]})$

$pOH = -log(1.78\cdot 10^{-5}) + log(\frac{0.1165 moles/0.250 L}{0.0683 moles/0.250 L}) = 4.98$

$pH = 14 - 4.98 = 9.02$

Therefore, the pH of the resulting solution is 9.02.

I hope it helps you!

5 0

3 years ago

NEED HELP WORTH 20 POINTS.!!

xz_007 [3.2K]

Answer:

sí

Explanation:

there's gas bubbles being formed and the temperature is changing which are both chemical changes

7 0

3 years ago

Read 2 more answers

A Metal mass of 71.68g occupies a volume of 8cm^3. Calculate the density

Damm [24]

Density = mass
--------------
volume

= 71.68
-------------
8

= 8.96 g/cm3.

Hope this helps!

5 0

4 years ago

How many grams of a 1000-gram radioactive sample are left after 3 half-lives? *

faltersainse [42]

The answer is 125 gms.

3 0

4 years ago