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vova2212 [387]
3 years ago
7

Under which circumstance might a gas decrease in volume when heated? A)The gas is held constant at STP. B)The gas remains under

uniform pressure. C)tHE GAS IS PLACE UNDER INCREASING PRESSURE. D)The gas undergoes a decrease in pressure
Chemistry
1 answer:
Tcecarenko [31]3 years ago
3 0

Answer is option C. The gas is placed under increased pressure.

Explanation:

According to Gas laws,

If the temperature to gas increases then the molecules of gas gets additional energy and moves with more spped than earlier which gives more more colliding to the walls of container. This increases pressure.

The volume and gas in a container are directly proportional to each other.

This means if the volume gets decreased then the collision of gas molecules to the walls increases which results increase in pressure.

Therefore, volume is inversely proportional to pressure.

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2 years ago
A scientist measures the standard enthalpy change for the following reaction to be -17.2 kJ : Ca(OH)2(aq) 2 HCl(aq)CaCl2(s)
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Answer: \Delta H^{0}=-173.72 kJ/mol

Explanation: <u>Enthalpy</u> <u>Change</u> is the amount of energy in a reaction - absorption or release - at a constant pressure. So, <u>Standard</u> <u>Enthalpy</u> <u>of</u> <u>Formation</u> is how much energy is necessary to form a substance.

The standard enthalpy of formation of HCl is calculated as:

\Delta ^{0}=\Sigma H_{products}-\Sigma H_{reactants}

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Standard Enthalpy of formation for the other compounds are:

Calcium Hydroxide: \Delta H^{0}= -1002.82 kJ/mol

Calcium chloride: \Delta H^{0}= -795.8 kJ/mol

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Enthalpy is given per mol, which means we have to multiply by the mols in the balanced equation.

Calculating:

-17.2=[-795.8+2(285.85)]-[-1002.82+2\Delta H]

-17.2=-1367.46+1002.82-2\Delta H

2\Delta H=17.2-364.64

\Delta H=-173.72

So, the standard enthalpy of formation of HCl is -173.72 kJ/mol

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2 years ago
How do carrier proteins transport substances across cell membranes?
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<em>Transport of substances across cell membrane:</em>
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3 years ago
Oh hi thanks for checking in I’m still a piece of garbage ^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^_^^ - ^
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Explanation:

check below for the solution

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