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3 years ago

Methane combines with oxygen in the air to make carbon dioxide and water vapor.

Chemistry

2 answers:

solniwko [45]3 years ago

7 0

Answer : The correct option is, (A) $CH_4+2O_2\rightarrow CO_2+2H_2O$

Explanation :

Balanced chemical reaction : It is defined as the number of atoms of individual elements present on reactant side must be equal to the product side.

As per question, when methane combines with oxygen then it react to give carbon dioxide and water vapor as a product.

Thus, the balanced chemical reaction will be,

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

This reaction is known as combustion reaction in which a hydrocarbon react with oxygen to given carbon dioxide and water as product.

Nataly_w [17]3 years ago

4 0

The answer is A because it cannot be B because that is ethylene and not D because it needs a subscript of 2 since it is a diatomic and it is no C because it is not carbon dioxide its oxygen

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When 1.008 g of hydrogen reacts with chlorine in a calorimeter containing 500.00 g water, the

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The heat released by reaction : C) -8870 J

<h3>Further explanation</h3>

Given

1.008 g of hydrogen

500.00 g water

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Q absorbed by water :

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3 years ago

23 grams of sodium reacts with 293 cm 3 of water that is initially at 298 K. It produces an enthalpy change of 197 kJ. What is t

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Answer:

THE FINAL TEMPERATURE OF WATER IS 459.32 K

Explanation:

Mass of sodium = 23 g

Volume of water = 293 cm3

Initial temperature = 298 K

Specific heat capacity of water = 4.18 J/Kg

Enthalpy change = 197 kJ = 197, 000 J

Heat = mass * specific heat * change in temperature

From the statement it shows that the initial temperature is 298 K or 25 °C and at this temperature the density of water is 0.99707 g/mL

Hence we can calculate the mass of water by using this formula:

Mass = volume * density

Mass = 293 cm3 * 0.99707 g/mL

Mass = 292.14 g

The enthalpy change = mass * specific heat * change in temperature

197, 000 = 292.14 * 4.18 * change in temperature

Change in temperature = 197 000 / 292.14 * 4.18

Change in temperature = 197 000 / 1221.1452

Change in temperature = 161.32 K

Hence, the final temperature of the water is therefore the addition of initial temperature and the change in temperature

Final temperature = initial temp + change in temp

Final temp = 298 K + 161.32 K

Final temp = 459.32 K

In conclusion, the final temperature of water is 459.32 K

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