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3 years ago

How many moles of each element (C, H, and O) are present in a 100.0 g sample of ethanol?

Chemistry

1 answer:

Anuta_ua [19.1K]3 years ago

7 0

Answer:

2.173 moles of ethanol is presented in a 100.0g sample of ethanol .

Explanation:

The amount of substance that contains as many Particles as there are atoms in exactly 12g of carbon- '12 isotope is called 1 mole '= 46 u.

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In a reaction, 24.9 L of N2 reacts with excess Hy to produce NH3. How many liters of NH3

Amiraneli [1.4K]

Answer:

A. 49.8L of NH3.

B. 33.83g.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is shown below:

N2 + 3H2 —> 2NH3

A. From the balanced equation above,

1L of N2 produced 2L of NH3.

Therefore, 24.9L of N2 will produce = 24.9 x 2 = 49.8L of NH3.

Therefore, 49.8L of NH3 is produced from the reaction.

B. Determination of the mass NH3 produced.

First, we shall determine the number of mole of NH3 produced. This can be obtained as follow:

Volume (V) = 49.8L

Pressure (P) = 97.8 kPa = 97.8/101.325 = 0.97atm

Temperature (T) = 23.7°C = 23.7°C + 273 = 296.7K

Gas constant (R) = 0.082atm.L/Kmol

Number of mole (n) =...?

PV = nRT

n = PV /RT

n = (0.97 x 49.8) / (0.082 x 296.3)

n = 1.99 mole

Next, we shall convert 1.99 mole to NH3 to grams. This is illustrated below:

Number of mole NH3 = 1.99 mole

Molar mass of NH3 = 14 + (3x1) = 17g/mol

Mass of NH3 =..?

Mass = mole x molar Mass

Mass of NH3 = 1.99 x 17

Mass of NH3 = 33.83g

Therefore, 33.83g of NH3 is produced.

6 0

4 years ago

If nutrients move into and out of ecosystems they can do so from various sources. Select which of the following is an example of

Valentin [98]

Answer:

Options (A), (B) and (C)

Explanation:

In an ecosystem, the transfer of nutrients takes place from one place o another. This input and output of nutrients continuously takes place in the ecosystem.

The rainwater is also essential as it carries a certain amount of valuable nutrients such as calcium, fluoride, magnesium, and iron that are mixed with water, and this enriches the fertility of the soil and the water is taken up by the roots of the plants for the growth and expansion of plants.

The nitrogen-fixing bacteria refers to those micro-organisms that are present in the soil and helps in the conversion of the atmospheric nitrogen into nitrogen compounds, which are helpful for the enhancement of the soil fertility.

Chemical weathering usually refers to the process by which the rocks disintegrates due to the effect of chemical reactions. The micro-organisms and the plant roots release some acids sometimes that react with the rocks and help in breakdown releasing the nutrients that are stored in the rocks. This eventually mixes up with the soil and increases the quality of the soil.

Thus, the correct answers are options (A), (B) and (C).

7 0

3 years ago

The chemical bonds in fuel are changed when the fuel is burned to move a car. What type of energy conversion is taking place in

Shtirlitz [24]

Answer:

Chemical energy to heat energy

Explanation:

The type of energy conversion when fuel is burnt to move a car is from chemical energy to heat energy.

One of the fundamental laws in chemistry postulates that "energy is neither created nor destroyed but transformed from one form to another".

This law suggests that energy can be transformed from one form to another.

In an automobile, the fuel is chemical compound with chains of hydrocarbons.
When these bonds are broken during combustion in the engine, the chemical energy, a form of potential energy, is converted to heat energy, a form of kinetic energy.
The heat energy is used to drive pistons and cause the mechanics of a car to begin to move.

4 0

3 years ago

Read 2 more answers

The ______ covers about 3/4 of the earth's surface

olga2289 [7]

The answer is hydrosphere

6 0

3 years ago

NASA continues to plan and conduct several missions to study

Tom [10]

Answer:

other planets and moons in the solar and beyond

Explanation:

NASA aims to find other planets and moons in our solar system, study them comparatively to earth and see if there's a possibility of been colonized by humans.

5 0

3 years ago