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ollegr [7]
3 years ago
11

Which of the following is the simplest representation of a molecule and its bonds?

Chemistry
1 answer:
yanalaym [24]3 years ago
6 0

Answer:

I can provide a proper answer since there are no choices provided.

Explanation:

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When heat is applied to 80 grams of CaCO3, it yields 39 grams of CO2. Determine
galben [10]

<u>Answer:</u> The percentage yield of CO_2 is 90.26%.

<u>Explanation:</u>

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}} ......(1)

Given mass of CaCO_3 = 80 g

Molar mass of CaCO_3 = 100 g/mol

Plugging values in equation 1:

\text{Moles of }CaCO_3=\frac{80g}{100g/mol}=0.8 mol

For the given chemical equation:

CaCO_3\rightarow CaO+CO_2

By the stoichiometry of the reaction:

If 1 mole of CaCO_3 produces 1 mole of CO_2

So, 0.8 moles of CaCO_3 will produce = \frac{1}{1}\times 0.8=0.8mol of CO_2

Molar mass of CO_2 = 44 g/mol

Plugging values in equation 1:

\text{Mass of }CO_2=(0.8mol\times 44g/mol)=35.2g

The percent yield of a reaction is calculated by using an equation:

\% \text{yield}=\frac{\text{Actual value}}{\text{Theoretical value}}\times 100 ......(2)

Given values:

Actual value of CO_2 = 35.2 g

Theoretical value of H_2CO_3 = 39 g

Plugging values in equation 2:

\% \text{yield of }CO_2=\frac{35.2g}{39g}\times 100\\\\\% \text{yield of }CO_2=90.26\%

Hence, the percentage yield of CO_2 is 90.26%.

8 0
3 years ago
Which items below are properties of matter? [select all that apply]
8_murik_8 [283]

Answer:

Solubility, length, hardness, color, mass, density, weight, volume, boiling, and point.

Explanation: Hope this helps

4 0
3 years ago
HELP WITH THIS EASY SCIENCE WORK
Trava [24]

Answer:(1)The urinary system's function is to filter blood and create urine as a waste by-product.

(2) two kidneys we have.

(3)The kidneys act as very efficient filters for ridding the body of waste and toxic substances, and returning vitamins, amino acids, glucose, hormones and other vital substances.

(4)Two ureters. These narrow tubes carry urine from the kidneys to the bladder. Muscles in the ureter walls continually tighten and relax forcing urine downward, away from the kidneys.

(5)A hollow, muscular, balloon-shaped organ that expands as it fills with urine.

(6)The urethra is the vessel responsible for transporting urine from the bladder to an external opening in the perineum.

(7)Urine is formed in the kidneys through a filtration of blood. The urine is then passed through the ureters to the bladder, where it is stored. During urination, the urine is passed from the bladder through the urethra to the outside of the body.

Explanation:

8 0
3 years ago
Bl Write a word equation for<br> the combustion of sulfur.
PolarNik [594]

 Example, when sulfur is burned in the air (one of my favorite chemical reactions) it combines with oxygen in the air to form an oxide. We consider this reaction in the form of a chemical equation: S (sulfur) + O2 (oxygen) |> SO2 (sulfur dioxide)

4 0
3 years ago
What happens when a student/ classmate gets Sulphuric in there eyes?
agasfer [191]

Answer:

don't try this in lab

Explanation:

  1. it can irritate eyes and cause burning
  2. swelling and tearing of eyes
  3. blurred vision and may cause blindness
4 0
2 years ago
Read 2 more answers
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