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2 years ago

Calculator Reference

Chemistry

1 answer:

kipiarov [429]2 years ago

3 0

Answer:

CO₂ + 4 H₂S + O₂ ---> CH₂O + 4 S + 3 H₂O

Explanation:

The unbalanced equation looks like this:

CO₂ + H₂S + O₂ ---> CH₂O + S + H₂O

Below is the amount of each element on each side of the reaction.

Reactants:

> 1 carbon, 2 hydrogens, 1 sulfur, 4 oxygens

Products:

> 1 carbon, 4 hydrogens, 1 sulfur, 2 oxygens

As you can see, there is a differing amount of hydrogens and oxygens on both sides. The balanced equation looks like this:

1 CO₂ + 4 H₂S + 1 O₂ ---> 1 CH₂O + 4 S + 3 H₂O

Below is the amount of each element on each side of the reaction.

Reactants:

> 1 carbon, 8 hydrogens, 4 sulfurs, 4 oxygens

Products:

> 1 carbon, 8 hydrogens, 4 sulfurs, 4 oxygens

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An industrial synthesis of urea obtains 87.5 kg of urea upon reaction of 68.2 kg of ammonia with excess carbon dioxide. Determin

dolphi86 [110]

Answer:

The theoretical yield of urea = <u>120.35kg</u>

The percent yield for the reaction = <u>72.70%</u>

Explanation:

Lets calculate -

The given reaction is -

$2NH_3(aq)+CO_2$ → $CH_4N_2O(aq)+H_2O (l)$

Molar mass of urea $CH_4N_2O$ = 60g/mole

Moles of $NH_3$ = $\frac{62.8kg/mole}{17g/mole}$ (since $Moles=\frac{mass of substance}{mass of one mole}$ )

= 4011.76 moles

Moles of $CO_2$ = $\frac{105kg}{44g/mole}$

= $\frac{105000g}{44g/mole}$

= 2386.36 moles

Theoritically , moles of $NH_3$ required = double the moles of $CO_2$

but , $4011.76$ , the limiting reagent is $NH_3$

Theoritical moles of urea obtained = $\frac{1 mole CH_4N_2O}{2mole NH_3}\times4011.76 mole NH_3$

= $2005.88mole CH_4N_2O$

Mass of 2005.88 mole of $CH_4N_2O$ = $2005.88 mole \times\frac{60g CH_4N_2O}{1mole CH_4N_2O}$

= 120352.8g

$120352.8g\times \frac{1kg}{1000g}$

= 120.35kg

Therefore , theroritical yeild of urea = 120.35kg

Now , Percent yeild = $\frac{87.5kg}{120.35kg}\times100$

72.70%

Thus , the percent yeild for the reaction is 72.70%

8 0

3 years ago

Match each item to its proper disposal method. Answers to be used more than once.

salantis [7]

Answer:

1. a)

2. a)

3. b)

4. d)

Explanation:

The disposal method is how we throw away the wastes. In a chemical lab, the correct disposal method guarantees the security of the environment and the humans and animals that may be in contact with the materials.

So:

1. Excess chemical: Because it can be toxic, it may be disposed of in the appropriate waste container, which will depend on the characteristics of the material;

2. Reaction mixture: As the excess chemical, it can be toxic, so it must be disposed of at an appropriate waste container;

3. Used filter paper: Generally, the solids in the filter paper is not toxic, so it can be thrown away in the trash can;

4. Cracked or chipped beaker: Because the beaker is made of glass, it can cut when broken, so it must go to a broken glass box, that will protect the people that will deal with it.

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3 years ago

Describe what happens to mass before and after a change in matter

Gala2k [10]

a. The mass is greater before the change occurs.

3 0

3 years ago

If an atom should form from its constituent particles,

tia_tia [17]

Answer:

(b) matter is lost and energy is released

Explanation:

When atoms are being formed from its constituent components it weighs less this is called mass defect so the answer would be (b) matter is lost and energy is released.

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3 years ago

What is meant by conversion of energy

MissTica

the process of changing one form of energy into another

4 0

3 years ago