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Fynjy0 [20]
3 years ago
7

A 1.0 M H2S solution has a pH = 3.75 at equilibrium. What is the value of Ka?

Chemistry
2 answers:
MrRa [10]3 years ago
7 0
The answer is 3.16*10-8
Lelechka [254]3 years ago
6 0
The answer is A, for help I watched some khan academy vids, they're very helpful
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Nitrate salts (NO3), when heated, can produce nitrites (NO2) plus oxygen (O2). A sample of potassium nitrate is heated, and the
Lostsunrise [7]

Answer: a) 0.070 moles of oxygen were produced.

b) New pressure due to the oxygen gas is 2.4 atm

Explanation:

According to ideal gas equation:

PV=nRT

P = pressure of gas = 2.7 atm

V = Volume of gas = 700 ml = 0.7 L

n = number of moles = ?

R = gas constant =0.0821Latm/Kmol

T =temperature = 329 K

n=\frac{PV}{RT}

n=\frac{2.7atm\times 0.7L}{0.0821 L atm/K mol\times 329K}=0.070moles

Thus 0.070 moles of oxygen were produced.

When the 700 mL flask cools to a temperature of 293K.

PV=nRT

P=\frac{nRT}{V}

P=\frac{0.070\times 0.0821\times 293}{0.7}

P=2.4atm

The new pressure due to the oxygen gas is 2.4 atm

7 0
4 years ago
Write a hypothesis:<br> What is the mole ratio of the cation and the anion in a precipitate?
tankabanditka [31]

Answer:

The mole ratio of the cation and the anion in a precipitate is a simple fraction. ( im sorry if this dosent help a lot.)

Explanation:

8 0
3 years ago
Why the mixture of bromine and ethane is discoloured when left in the sun​
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Answer:

In the presence of UV light, ethane will react with bromine in a substitution reaction. UV light is the condition under which the reaction will occur so it is written above the arrow in the chemical equation. As the reaction proceeds, the intensity of the re-brown colour of the bromine water decreases.

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A beaker? I believe
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How could you tell what element it is if only a model was present?​
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You can look at the number of valence electrons and look at the size of the molecule itself to determine which element in this certain group is shown on the model.
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