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Afina-wow [57]
4 years ago
13

Which statements describe molecules? Check all that apply.

Chemistry
2 answers:
padilas [110]4 years ago
4 0

a,c,f Nerds cmon its easy

Scrat [10]4 years ago
3 0

The following answers are A, C, and F

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You need to produce a buffer solution that has a pH of 4.97. You already have a solution that contains 10. mmol (millimoles) of
motikmotik

Answer:

16.9 mmoles are needed to add to the solution

Explanation:

To solve this, we can apply the Henderson Hasselbach equation:

Acetic acid → CH₃COOH

CH₃COOH  +  H₂O  ⇄  CH₃COO⁻   +  H₃O⁺             Ka

That is the acid base equilibrium, to determine the amount:

pKa of acetic acid is 4.74

Henderson Hasselbach formula is:

pH = pKa + log (base/acid)

We replace  →  4.97 = 4.74 + log (B / 10mmoles)

Let's verify mmoles of B

4.97 - 4.74 = log (B/10)

0.23 =  log (B/10)

10^(0.23) = 10^(log (B/10)

1.698 = B/10

B = 1.698 . 10 → 16.9 mmoles

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3 years ago
What is the molar mass of magnesium nitride (Mg3N2) if the molar mass of magnesium is 24.31g and nitrogen is 14.01g?
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Mg3N2

Mg - 3 times 24.31 g=  72.93 g

N - 2 times 14.01 g=  +  28.02 g
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