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2 years ago

How many grams of water are needed to form 21.8 grams of oxygen gas?

Chemistry

1 answer:

GaryK [48]2 years ago

5 0

Answer:

24.5g

Explanation:

Given parameters:

Mass of oxygen gas = 21.8g

Unknown:

Mass of water = ?

Solution:

This problem deals with the decomposition of water;

Reaction equation;

2H₂O → 2H₂ + O₂

2 mole of water will produce 1 mole of oxygen gas

First find the number of mole of the oxygen gas given;

Number of moles = $\frac{mass}{molar mass}$

molar mass of O₂ = 2(16) = 32g/mol

Number of moles of O₂ = $\frac{21.8}{32}$ = 0.68moles

1 mole of oxygen gas will be produced from 2 mole of water

0.68moles of oxygen gas will be produce from 0.68 x 2 moles of water; = 1.36moles of water

Mass of water = number of moles x molar mass

Molar mass of water = 2(1) + 16 = 18g/mol

Mass of water = 1.36 x 18 = 24.5g

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Answer:

ΔS surrounding (entropy change of the reservoir) = -1 J/K

Explanation:

Given:

Change in heat (ΔH) = 150 joules

Temperature (T) = 150 K

Find:

ΔS surrounding (entropy change of the reservoir)

Computation:

ΔS surrounding (entropy change of the reservoir) = - ΔH / T

ΔS surrounding (entropy change of the reservoir) = - 150 / 150

ΔS surrounding (entropy change of the reservoir) = -1 J/K

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Answer:

The role that chlorine atoms have in increasing the depeltion rate ozone is that Cl acts as a catalyst.

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From the two steps of the reaction:

O₃ + Cl· → ClO· + O₂
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The overall reaction is: O₃ + O → 2O₂

It is clear that ClO· is an intermediate that has been produced within the first step and has been consumed in the second step.

Also, Cl· is considered as a catalyst in this reaction that it has been consumed in the first step and has been produced in the second step, which means that it does not get up in the reaction, that is the main characteristic of the catalyst.

The catalyst usually increases the rate of the reaction by lowering its energy of activation (The minimum energy that is required to initiate the reaction) by proceeding the reaction in an alternative pathway <em>(changing the reaction mechanism)</em>.

Hence, the role affecting the reaction rate that chlorine atoms have in increasing the depletion rate of ozone that it acts as a catalyst and does not get used up in the reaction.

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Which substance can not be decomposed by a chemical change?

just olya [345]

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Answer:

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Explanation:

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3 years ago

AT constant temperature, a gas is compressed from 5.5 L to 1 L. At 1 L, the pressure of the gas is 98.2 kPa. What was the origin

svet-max [94.6K]

We have that the original pressure of this gas is mathematically given as

P2=17.854 kPa

<h3>Boyle's law</h3>

Question Parameters:

AT constant temperature, a gas is compressed from 5.5 L to 1 L.

At 1 L, the pressure of the gas is 98.2 kPa

Generally the equation for Boyle's law is mathematically given as

P1V1=P2V2

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