Chemistry, 04.07.2019 14:00 ashleyheink3796

When methane, ch4, is combusted, it produces carbon dioxide, co2, according to the unbalanced equation: ch4 + o2 → co2 + h2o. write the balanced equation for this reaction, and explain how it is possible for 10 grams of methane fuel to burn and emit 27 grams of carbon dioxide. discuss whether or not this reaction obeys the law of conservation of mass.

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Answer from: lilquongohard

Answer : The balanced equation for this reaction is,

$CH_4+2O_2\rightarrow CO_2+2H_2O$

Solution : Given,

Molar mass of CH_4 = 16 g/mole

Molar mass of CO_2 = 44 g/mole

The Net balanced equation for this reaction is,

$CH_4+2O_2\rightarrow CO_2+2H_2O$

First we have to calculate the moles of CH_4

Moles of CH_4 = $\frac{\text{ Given mass of }CH_4}{\text{ Molar mass of }CH_4}=\frac{10g}{16g/mole}=0.625moles$

Moles of CH_4 = 0.625 moles

From the balanced equation we conclude that

1 mole of CH_4 gives 1 mole of CO_2

0.625 moles of CH_4 gives $\frac{1mole}{1mole}\times 0.625moles=0.625moles$ of CO_2

Moles of CO_2 = 0.625 moles

Now we have to calculate the Mass of CO_2 .

Mass of CO_2 = Moles of CO_2 × Molar mass of CO_2 = 0.625 moles × 44 g/mole = 27.5 g

Mass of CO_2 = 27.5 g

It is possible for 10 grams of methane fuel to burn and emit 27 grams of carbon dioxide.

Law of conservation of mass : In a chemical reaction, the mass of products must be equal to the mass of reactants.

For Net balanced chemical equation:

The mass of reactant side, $CH_4+2O_2=(12+4\times 1)+(4\times 16)=80g$

The mass of product side, $CO_2+2H_2O=(12+2\times 16)+2(2\times 1+16)=80g$

That means, the mass of product is equal to the mass of reactant. The mass remains conserved.

For Unbalanced chemical equation:

The mass of reactant side, $CH_4+O_2=(12+4\times 1)+(2\times 16)=48g$

The mass of product side, $CO_2+H_2O=(12+2\times 16)+(2\times 1+16)=62g$

This means, the mass of product is not equal to the mass of reactant. The mass is not conserved.

The Net balanced chemical equation obeys the law of conservation of mass but unbalanced equation are not obeys the law of conservation of mass.

Answer from: Quest

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

Answer from: Quest

Answer : option c) heat is released during the process.explanation :

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

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When methane, ch4, is combusted, it produces carbon dioxide, co2, according to the unbalanced equati...

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