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3 years ago

Help me please????? Please

Chemistry

1 answer:

Tems11 [23]3 years ago

6 0

1. A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.

2. They can lower the energy of the transition state, so overall activation energy needed for the reaction decreases, or they can alter the mechanisms of a reaction and thus change the transition state.

3. I am not certain

I apologize if this is not what you meant.

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A gas of unknown molecular mass was allowed to effuse through a small opening under constant-pressure conditions. It required 10

Shtirlitz [24]

Answer:

The molar mass of the unknown gas is 392 g/mole

Explanation:

Firstly we write out the parameters

Volume of the gas X that effuse for 105 s = 1.0 L

Volume of the O₂ gas that effuse for 30 s = 1.0 L

Molar mass of O₂ = 32 g/mole

Rate of effusion of the gas X = 1.0 L/105 s = 0.0095 L/s

Rate of effusion of O₂ gas = 1.0 L/30 s = 0.033 L/s

Graham's law of effusion states that

$\frac{Rate A}{Rate B} = \sqrt{\frac{Molar mass B}{Molar mass A} }$

Therefore we have

$\frac{0.0095 L/s}{0.033 L/s} =\sqrt{\frac{32 g/mole}{Molar mass of X} }$ or Molar mass of X = $\frac{32}{0.0816}$ g/mole = 391.99 g/mole

The molar mass of the unknown gas is 391.99 g/mole ≈ 392 g/mole

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3 years ago

The molecular weight for this compound is 60.09 g/mol. What is the molecular formula for this compound?

stepan [7]

Answer:

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3 years ago

Based on the ionization energies of the alkali metals, which alkali metal would you expect to undergo the least exothermic react

ASHA 777 [7]

Answer:

Explanation:

In this case, "least exothermic" means that the correct answer is the least reactive of the alkali metals.

The lower the ionization energy is, the higher the reactivity of the alkali metal is.

With the above information in mind, and remembering that ionization energy tends to decrease as we go down the group in the periodic table, the correct answer is Li, as it has the highest ionization energy among the alkali metals.

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4 years ago

What happens to a gas as it is cooled below 0*C

Damm [24]

Sorry but it depends on the gas in question and it's temperature of condensing /boiling point if this it 0° it will turn liquid

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4 years ago

Read 2 more answers

Phosgene is a highly toxic gas made up of carbon, oxygen, and chlorine atoms. Its density at 1.05 atm and 258C is 4.24 g/L. (a)

VikaD [51]

Answer:

Molar mass = 99 g/mol

Explanation:

Phosgene contains carbon, oxygen and chlorine atoms. Its molecular formular is; COCl2

The molar mass is given as the sum off the individual atomic mass of the elements in the compound.

Molar mass = C + O + 2Cl

Molar mass = 12 + 16 + 2(35.5)

Molar mass = 99 g/mol

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3 years ago