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vovikov84 [41]
3 years ago
11

Which of the following combinations led to a precipitation reaction?

Chemistry
1 answer:
Pani-rosa [81]3 years ago
3 0

(3) Silver Nitrate and Aluminium Sulfate

<u>Explanation:</u>

Silver nitrate and aluminium sulphate reacts to form Aluminium nitrate and silver sulfate.

The reaction is shown below:

6AgNO₃ (aq) + Al₂(SO₄)₃ (aq) → 2Al(NO₃)₃ (aq) + 3Ag₂SO₄ (S)

From the balanced equation we can see that Ag₂SO₄ or silver sulfate is the precipitate formed.

Aluminium sulfate and silver nitrate both are chemical compounds. There are many reactions that uses net ionic equation like acid-base neutralization reaction, redox reaction, double displacement reaction etc.

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Answer:

12.8 g of O_{2} must be withdrawn from tank

Explanation:

Let's assume O_{2} gas inside tank behaves ideally.

According to ideal gas equation- PV=nRT

where P is pressure of O_{2}, V is volume of O_{2}, n is number of moles of O_{2}, R is gas constant and T is temperature in kelvin scale.

We can also write, \frac{V}{RT}=\frac{n}{P}

Here V, T and R are constants.

So, \frac{n}{P} ratio will also be constant before and after removal of O_{2} from tank

Hence, \frac{n_{before}}{P_{before}}=\frac{n_{after}}{P_{after}}

Here, \frac{n_{before}}{P_{before}}=\frac{0.66mol}{43atm} and P_{after}=17atm

So, n_{after}=\frac{n_{before}}{P_{before}}\times P_{after}=\frac{0.66mol}{43atm}\times 17atm=0.26mol

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Molar mass of O_{2} = 32 g/mol

So, mass of O_{2} must be withdrawn = (32\times 0.40)g=12.8g

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