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3 years ago

What is the ph of a 0.15 m solution of ammonium chloride?

1 answer:

7 0

Best Answer: (a)
8.9 x 10^-7 = x^2 / 0.15-x
x = [OH-] = 0.00037 M
pOH = 3.4
pH = 14 - 3.4 = 10.6

(b)
Ka = Kw/Kb = 5.6 x 10^-10 = x^2 / 0.20-x
x = [H+] = 0.000011 M
pH = 5.0

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2 years ago

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HELP. What change in state occurs when water boils? And why does this change happen??

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3 years ago

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pychu [463]

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2 years ago

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What is true about: Na+1?

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Hey there!

Na is sodium, which has 11 protons.

The more realistic amount of neutrons for this atom to have is 12. 23 would be the sum of protons and electrons.

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11 - 1 = 10 electrons.

Your answer is d. it has 11 protons, 10 electrons, and 12 neutrons.

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3 years ago

If hydrogen were used as a fuel, it could be burned according to the following reaction: H2(g)+1/2O2(g)→H2O(g). Use average bond

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The deltaHrxn = -243 kJ/mol the deltaHrxn of CH4(methane) = -802 kJ/mol

The fuel that yields more energy per mole is METHANE. The negative sign merely signifies the release of energy. Thus, 802 kJ/mol is greater than 243 kJ/mol.

The fuel that yields more energy per gram is HYDROGEN. Here is the computation:
deltaHrxn = (-243 kJ/mol)(1 mol/2.016 g H2) = -120.535714286 kJ/g or -121 kJ/g

deltaHrxn of CH4(methane) = (-802 kJ/mol)(1 mol/16.04 g)
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As discussed the negative sign serves as the symbol of released energy. Thus, 121 is greater than 50.

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