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natulia [17]
3 years ago
5

How is Hess's law used to measure enthalpy of a desired reaction?

Chemistry
1 answer:
Morgarella [4.7K]3 years ago
6 0

Answer:

D

Explanation:

I hope this is correct

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Starting with the partially balanced equation, C2H5OH(l)+?O2(g)→2CO2(g)+3H2O(l) what coefficient should be placed in front of O2
SpyIntel [72]

<u>Answer:</u> The coefficient '3' should be placed infront of oxygen gas to balance the oxygen atoms.

<u>Explanation:</u>

Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.  

This also means that total mass on the reactant side must be equal to the total mass on the product side.

A balanced chemical equation is defined as the equation in which total number of individual atoms on the reactant side is equal to the total number of individual atoms on product side.

For the given chemical reaction, the balanced equation follows:

C_2H_5OH(l)+3O_2(g)\rightarrow 2CO_2(g)+3H_2O(l)

By Stoichiometry of the reaction:

1 mole of ethanol reacts with 3 moles of oxygen gas to produce 2 moles of carbon dioxide gas and 3 moles of water molecule

Hence, the coefficient '3' should be placed infront of oxygen gas to balance the oxygen atoms.

5 0
3 years ago
20 points
Alik [6]

Answer:

The answer to your question is a balanced equation

Explanation:

Chemical formulas  are extremely useful in chemistry and these formulas follow the law of proportions but not the law of conservation of matter.

Coefficients  indicate that an equation is balanced if these numbers are in proportion but it is not the answer.

Balanced equation  is a feature of the law of conservation of matter.

Subscripts are necessary for chemical reactions but they are not a feature of the law of conservation of matter.

4 0
3 years ago
Read 2 more answers
To insert a thermometer into an adapter, use ______ to prepare the thermometer. Then, hold the thermometer ______ the adapter an
Sati [7]

Answer:

mineral oil; close to; slowly turn

Explanation:

Temperature can be defined as a measure of the degree of coldness or hotness of a physical object. It is measured with a thermometer and its units are Celsius (°C), Kelvin (K) and Fahrenheit (°F).

Generally, temperature measures the average kinetic energy of particles in a particular substance.

A thermometer can be defined as a device used for measuring the temperature (degree of hotness or coldness) of a body or substance is. It is a thin glass having a bulb on one of its end and typically contains either colored alcohol or mercury.

A thermometer adapter is used with a temperature probe in the distillation process, in order to determine readings.

To insert a thermometer into an adapter, use mineral oil to prepare or make suitable the thermometer. Then, hold the thermometer close to the adapter and slowly turn the thermometer into the adapter.

4 0
3 years ago
40 g of sodium reacts with ____ g of chlorine to produce 117 g of sodium chloride *
Romashka-Z-Leto [24]

Answer:

9.26g of chlorine

Explanation:

7 0
3 years ago
Jenny knows that the atomic number of the element potassium, K, is 19. She also
hoa [83]

Answer:

c. 39

Explanation:

You round the number 39.098 to make it easier. Since you can't round it up to forty because the number after the 9 in-front of the decimal is a over i is unable to be rounded up

8 0
3 years ago
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