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4 years ago

Which of the following is necessary to do a complete stoichiometric calculation? A) Add the nuclear masses of the products.

Chemistry

1 answer:

Katena32 [7]4 years ago

5 0

Answer:

Option (C). Write the complete balanced chemical equation.

Explanation:

Writing a balanced chemical equation is the key to arriving at the correct stoichiometric calculations because it gives a fore knowledge of the correct amount of reactants needed to generate a predicted products for a given reaction

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A hydrocarbon is burnt completely to give 3.447g of

goblinko [34]

Answer: The empirical formula for the given compound is $CH_2$

Explanation:

The chemical equation for the combustion of compound having carbon, hydrogen, iron and oxygen follows:

$C_xH_y+O_2\rightarrow CO_2+H_2O$

where, 'x' and 'y' are the subscripts of carbon and hydrogen respectively.

We are given:

Mass of $CO_2=3.447g$

Mass of $H_2O=1.647g$

We know that:

Molar mass of carbon dioxide = 44 g/mol

Molar mass of water = 18 g/mol

For calculating the mass of carbon:

In 44g of carbon dioxide, 12 g of carbon is contained.

So, in 3.447 g of carbon dioxide, $\frac{12}{44}\times 3.447=0.940g$ of carbon will be contained.

For calculating the mass of hydrogen:

In 18g of water, 2 g of hydrogen is contained.

So, in 1.647 g of water, $\frac{2}{18}\times 1.647=0.183g$ of hydrogen will be contained.

To formulate the empirical formula, we need to follow some steps:

Step 1: Converting the given masses into moles.

Moles of Carbon = $\frac{\text{Given mass of Carbon}}{\text{Molar mass of Carbon}}=\frac{0.940g}{12g/mole}=0.0783moles$

Moles of Hydrogen = $\frac{\text{Given mass of Hydrogen}}{\text{Molar mass of Hydrogen}}=\frac{0.183g}{1g/mole}=0.183moles$

Step 2: Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.0783 moles.

For Carbon = $\frac{0.0783}{0.0783}=1$

For Hydrogen = $\frac{0.183}{0.0783}=2.34\approx 2$

Step 3: Taking the mole ratio as their subscripts.

The ratio of C : H = 1 : 2

Hence, the empirical formula for the given compound is $CH_2$

8 0

4 years ago

Which component is missing from the process of photosynthesis?

lisabon 2012 [21]

I believe the answer is 1-Water :)

3 0

3 years ago

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Which color of visible light has the shortest wavelength?

Otrada [13]

Answer:

Hi! Your answer should be (C.) violet

Explanation:

Violet had the shortest wavelength, at around 380 nanometers. Red has the longest wavelength, at around 700 nanometers. Hope this helps!

8 0

3 years ago

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Write the balanced chemical equation for the Haber-Bosch process, that is, the combination of nitrogen and hydrogen to form ammo

RoseWind [281]

The balanced chemical equation for the Haber-Bosch process is N₂(g) + 3H₂(g) → 2NH₃(g). The Haber-Bosch process played a significant role in boosting agriculture back in the day. It paved the way for the industrial production of ammonia which is used in the manufacture of fertilizers. The process involves reacting atmospheric N₂ with H₂ using a metal catalyst under high temperature and pressure.

6 0

3 years ago

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Which statements accurately describe soap? Select one or more: check_boxSoaps should be weakly alkaline in solution. check_box_o

Firdavs [7]

Answer:

Soaps are a mixture of fatty acid salts and glycerol.

Explanation:

Soap is made from the reaction

Fat and oil + caustic alkali = fatty acid salt + glycerol(propane-1,2,3-triol)

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3 years ago