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3 years ago

In the reaction 2K + 2H2O→2KOH + H2 , which compound has an element ratio of 2:1 ?

Chemistry

2 answers:

Katyanochek1 [597]3 years ago

5 0

Answer:

Option O = H₂O

Explanation:

Chemical reaction:

2K + 2H₂O → 2KOH + H₂

In this balanced chemical equation we can see that water is the only compound that consist of two hydrogen atom and one oxygen atom. H : O

2 : 1 .

In case of KOH two hydroxyl and two potassium atom are present and ration is K:OH 1:1.

stich3 [128]3 years ago

3 0

Answer: Option (c) is the correct answer.

Explanation:

A compound is defined as the substance in which different elements are chemically combine together in a fixed ratio by mass.

For example, $H_{2}O$ and KOH are both compounds in the given reaction equation.

Here, in $H_{2}O$ the atoms are present in 2:1 ratio and in KOH compound the atoms are present in 1:1 ratio.

A compound can be divided into its constituent or simpler substances.

Thus, we can conclude that in the given reaction only $H_{2}O$ is the compound which has an element ratio of 2:1.

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3 years ago

Read 2 more answers

9. Using the balanced equation from Question #8, how many grams of lead will be produced if 2.54 grams of PbS is burned with 1.8

MissTica

Answer: 2.24 grams of Pb

Explanation:

Balanced chemical reaction;

2PbS + 3O2 → 2Pb + 2SO3

Moles of both PbS and O2

Moles = mass / molar mass

Moles of PbS = 2.54 g / 239.3 g/mol = 0.0108 moles

Moles of O2 = 1.88 / 32 g/mol = 0.0588 moles

Finding the limiting reactant.

Limiting reactant, is that reactant which is completely used in the reaction;

If we assume that PbS is the limiting reactant;

We have 0.0588 moles of O2. This needs ( 0.0588 * 2) / 3 = 0.0392 moles of PbS to fully react. But we have only 0.0108 moles of PbS available. That means that the PbS will be completely consumed hence the limiting reactant

If we assume O2 is the limiting reactant;

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Moles of lead

For this step we apply the mole ratios with the limiting reactant;

Mole ratio of PbS : Pb = 2 : 2 = 1 : 1

Therefore;

Moles of Pb = (0.0108 moles * 1 ) 1

Moles of Pb =0.0108 moles

Mass of Pb

Mass = moles * molar mass

Mass of Pb =0.0108 moles * 207.2 g/mol

Mass of Pb = 2.24 grams

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2 years ago

The step by step direction of a experiment are found in...

blondinia [14]

Answer:

I believe it the Data Table

Explanation:

because that the final step of an experiment; recording your data throughout the experiment, and that where you recorded your steps and information throughout the experiment.

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2 years ago

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11 months ago

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Likurg_2 [28]

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Solution : Given,

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Formula used :