3 years ago

In which process does a solid change directly into a vapor?

Chemistry

1 answer:

IrinaVladis [17]3 years ago

5 0

In Sublimation, a solid changes directly into a vapor.

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In the presence of excess oxygen, methane gas burns in a constant-pressure system to yield carbon dioxide and water: CH4 (g) + 2

djyliett [7]

Answer:

-100.125

Explanation:

We are given

CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l) △H = -890.0 kJ/mol

The given information is for complete reaction

we have 1.8grams of Methane

Molar mass of CH4 = 16

No of moles of Methane = 1.8/ 16

= 0.1125

So the amount of the heat will be released from the amount of the methane

Q = No of moles*( -890.0 kJ/mol)

= 0.1125*(-890)

= -100.125kJ/mole

Therefore the amount of Energy released from 1.8 grams of methane is equal to -100.125

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Misha Larkins [42]

Answer:

37.

Explanation:

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What is the percent composition by mass of chlorine in LiCI

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Answer: Lithium (Li) 16.373%

Chlorine (Cl) 83.627%

Explanation:

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16. Why do the atoms of H, O, N, F, CI, I, and Br have tendencies to bond with themselves?

Natasha2012 [34]

Because they are elements

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1) 2C2H6 + 7O2 --> 4CO2 + 6H2O

Lena [83]

Answer:

a).

$2 \: moles \: of \: ethane \: react \: with \: 7 \: moles \: of \: oxygen \\ 24 \: moles \: react \: with \: ( \frac{24 \times 7}{2} ) \: moles \\ = 84 \: moles$

b).

$2 \: moles \: react \: with \: 7 \: moles \\ ( \frac{12 \times 2}{7} ) \: moles \: react \: with \: 12 \: moles \\ = 3 .43 \: moles \\ 1 \: mole \: weighs \: 30 \: g \\ 3.43 \: moles \: weigh \: (3.43 \times 30) \\ = 102.9 \: g$

c).

746.7 g

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3 years ago