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Snowcat [4.5K]
3 years ago
12

Why does the density for sample of a substance typically decrease as it changes from the solid to liquid state and decrease as i

t changes from the liquid to gaseous state?
Chemistry
1 answer:
jarptica [38.1K]3 years ago
4 0

Explanation:

The density of substance is the ratio of mass to volume.

For solids it is maximum ans decreases from solid to liquid to gases.The ratio decreases as the distance between the molecules increases and hence volume increases consequently density decreases. Inter molecular distance is maximum to minimum from solid to gases.

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3 covalent bonds (there are 2 electrons in the first orbital and 5 in the second. You still have room for three more)
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Use molecular structure and intermolecular bonding to describe why bromine has a lower boiling point than water
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ΔG o for the reaction H2(g) + I2(g) ⇌ 2HI(g) is 2.60 kJ/mol at 25°C. Calculate ΔG o , and predict the direction in which the rea
kondaur [170]

Answer:

The reaction is not spontaneous in the forward direction, but in the reverse direction.

Explanation:

<u>Step 1: </u>Data given

H2(g) + I2(g) ⇌ 2HI(g)     ΔG° = 2.60 kJ/mol

Temperature = 25°C = 25+273 = 298 Kelvin

The initial pressures are:

pH2 = 3.10 atm

pI2 = 1.5 atm

pHI 1.75 atm

<u>Step 2</u>: Calculate ΔG

ΔG = ΔG° + RTln Q  

with ΔG° = 2.60 kJ/mol

with R = 8.3145 J/K*mol

with T = 298 Kelvin

Q = the reaction quotient → has the same expression as equilibrium constant → in this case Kp = [p(HI)]²/ [p(H2)] [p(I2)]

with pH2 = 3.10 atm

pI2 = 1.5 atm

pHI 1.75 atm

Q = (3.10²)/(1.5*1.75)

Q = 3.661

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ΔG = 2600 J/mol + 8.3145 J/K*mol * 298 K * ln(3.661)  

ΔG =5815.43 J/mol = 5.815 kJ/mol

To be spontaneous, ΔG should be <0.

ΔG >>0 so the reaction is not spontaneous in the forward direction, but in the reverse direction.

4 0
3 years ago
What is the average mass of a single chlorine atom in grams
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5 0
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