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Lynna [10]
3 years ago
7

Please help with that problem Important İ have quiz tomorrow

Chemistry
1 answer:
iogann1982 [59]3 years ago
6 0

Answer:

Final pressure of the gas remaining in the first container is 3.5 atm

Explanation:

Since it is given that temperature is constant , we can apply -

PV=constant , where

P = Pressure of the gas

V = Volume of the container in which the gas is contained

Initially,

For container 1 -

P_{i} = 4 atm

V_{1} = 6 L

Finally,

For container 2 -

P_{f,2} = 3 atm

V_{2} = 1 L

For container 1 -

P_{f,1} = ?

V_{1} = 6 L

∴ P_{i}V_{1} = P_{f,1}V_{1} + P_{f,2}V_{2}

∴ 4×6 =  (P_{f,1}×6) +(3×1)

∴ P_{f,1} = 3.5 atm

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3 years ago
Read 2 more answers
KNO3(s) --> K+(aq) + NO3-(aq)
ella [17]

Answer:

KNO₃(s) + 35,1 kJ → K⁺(aq) + NO₃⁻(aq)

Explanation:

In the reaction:

KNO₃(s) → K⁺(aq) + NO₃⁻(aq)

The <em><u>heat absorbed</u></em> for the reaction (Because the temperature decreases) is:

Q = C×m×ΔT

Where C is specific heat (4,18J/g°C); m is mass (100g); ΔT is (30,0°C-21,6°C = 8,4°C)

Replacing:

Q = 4,18J/g°C×100g×8,4°C

<em><u>Q = 3511 J</u></em>

Now, moles of KNO₃ are:

10,1g×(1mol / 101g) = <em><u>0,1 moles.</u></em>

Heat of solution in kJ/mol is:

3,511 J / 0,1 mol = <em><u>35,1 kJ</u></em>

As the heat was absorbed for the reaction, right answer is:

<em>KNO₃(s) + 35,1 kJ → K⁺(aq) + NO₃⁻(aq)</em>

That means the reaction needs the heat to occurs.

I hope it helps!

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Answer:

Explanation:

A new Material is formed.

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A Magnesium strip placed in CuSO4 solution made the Mg strip turn into a new substance which is MgSO4. this is a Chemical change because Mg has now become a different substance called MgSO4.

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Answer:

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Explanation:

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