What is the mass percent of oxygen in sodium bicarbonate (NaHCO3)?

Answers

Answer 1

Answer: The answer is 57.14%.

First we need to calculate molar mass of NaHCO3. Molar mass is mass of 1 mole of a substance. It is the sum of relative atomic masses, which are masses of atoms of the elements.

Relative atomic mass of Na is 22.99 g
Relative atomic mass of H is 1 g
Relative atomic mass of C is 12.01 g
Relative atomic mass of O is 16 g.

Molar mass of NaHCO3 is:
22.99 g + 1 g + 12.01 g + 3 · 16 g = 84 g

Now, mass of oxygen in NaHCO3 is:
3 · 16 g = 48 g

mass percent of oxygen in NaHCO3:
48 g ÷ 84 g · 100% = 57.14%

Therefore, the mass percent of oxygen in sodium bicarbonate is 57.14%.

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Determine the percent yield for the reaction between 46.5 g of ZnS and 13.3 g of oxygen if 18.l4 g of ZnO is recovered along with an unknown quantity of sulfur
dioxide.
please show work thank you

Answers

The percentage yield of the reaction has been 46.74%.

Percentage yield can be given as the ratio of the actual yield to the theoretical yield.

For the theoretical yield, the balanced equation will be:

$\rm 2\;ZnS\;+\;3\;O_2\;\rightarrow\;2\;ZnO\;+\;2\;SO_2$

Thus, 2 moles of ZnS will give 2 moles of ZnO.

The moles of 46.5 g ZnS:

Moles = $\rm (weight)/(molecular\;weight)$

ZnS = $\rm (46.5)/(97.474)$

ZnS = 0.477 mol

The moles of 13.3 grams Oxygen:

Oxygen = $\rm (13.3)/(32)$

Oxygen = 0.415 mol.

The moles of 18.14 grams ZnO:

ZnO = $\rm (18.14)/(81.38)$

ZnO = 0.222 mol

According to the balanced chemical equation,

2 moles ZnO = 2 moles ZnS

0.222 mol ZnO = 0.222 mol ZnS

2 moles ZnO = 3 moles Oxygen

0.222 mol ZnO = 0.334 mol of Oxygen

Since, both the reactants are in enough concentration,

The theoretical yield can be calculated with any of the reactants. The theoretical yield of ZnO from 46.5 grams of ZnS can be given as:

1 mole ZnS = 1 mol ZnO

0.477 mol of ZnS = 0.477 mol of ZnO.

The mass of 0.477 mol of ZnO:

Mass = moles $*$ molecular weight

Mass of ZnO = 0.477 $*$ 81.38

Mass of ZnO = 38.818 grams.

The theoretical yield of ZnO = 38.818 g.

The actualyield of ZnO = 18.14 g.

Percentage yield = $\rm (18.14)/(38.81)\;*\;100$

Percentage yield = 46.74 %

The percentage yield of the reaction has been 46.74%.

For more information about the percentage yield, refer to the link:

brainly.com/question/11715808

Found an answer sheet :)

Compute 3.5×4.48697. Round the answer appropriately. Express your answer numerically using the proper number of significant figures.

Answers

16 because the actual answer is 15.704395 then u round the .7 because it greater than 5 making it 16

Final answer:

The product of 3.5 and 4.48697 is 15.705395, which rounds to 16 when using the appropriate number of significant figures.

Explanation:

To find the product of 3.5 and 4.48697, you would simply multiply the two numbers together. This results in 15.705395.

However, the least number of significant digits in the numbers given is two (in the number 3.5). Therefore, we will round our answer to two significant figures. 15.705395 rounds to 16 when rounding appropriately to two significant figures as we count from the first non-zero digit, which is 1, then to the next digit which is 5.

Learn more about Multiplication and rounding numbers here:

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How many molecules are there in 4.00 moles of glucose

Answers

i got 20.88 x 10^23 to be the answer

Final answer:

The total amount of energy in the cooler remains the same. The warm soda transfers its heat energy to the ice, causing the soda to cool and the ice to melt. The cooler, soda, and water from the melted ice eventually reach a thermal equilibrium where they have the same temperature.

Explanation:

In the scenario where a student puts a warm can of soda in a cooler filled with ice, the amount of thermal energy in the cooler's system changes due to the process of heat transfer. This process follows the second law of thermodynamics which stipulates that heat tends to flow from hotter objects to colder objects until they reach equilibrium.

In this case, the warmer soda will transfer its heat to the colder ice. During this process, the ice will absorb the heat without a rise in temperature until all of it has melted. This is because this absorbed energy is used to break the bonds holding the ice molecules together in a solid state, causing a phase change to liquid water.

Simultaneously, the soda can's temperature drops as it loses heat to the ice. Eventually, everything in the cooler—the soda, the melted ice water, and the air within—will reach the same temperature, marking the achievement of thermal equilibrium. Therefore, the total amount of energy in the cooler remains the same, it's just transferred (not lost or gained). The energy initially within the can of soda is transferred to the ice, and the overall rise in the cooler’s temperature represent this energy transfer.

Learn more about Heat Transfer here:

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What is a Benedict solution?

Answers

Benedict's solution, deep-blue alkaline solution used to test for the presence of the aldehyde functional group, - CHO. The substance to be tested is heated with Benedict's solution; formation of a brick-red precipitate indicates presence of the aldehyde group. Since simple sugars (e.g., glucose) give a positive test, the solution is used to test for the presence of glucose in urine, a symptom of diabetes. One liter of Benedict's solution contains 173 grams sodium citrate, 100 grams sodium carbonate, and 17.3 grams cupric sulfate pentahydrate. It reacts chemically like Fehling's solution; the cupric ion (complexed with citrate ions) is reduced to cuprous ion by the aldehyde group (which is oxidized), and precipitates as cuprous oxide, Cu2O

What is the best description of what Becquerel observed in his experiment?

Answers

He is best known for his discovery of radioactivity, first reported just over a century ago in the selection reproduced here. The discovery of radioactivity thus represents a key development in the modern understanding of the atom. Hope this helps. Have a nice day.

Q(0,5) and R(2,1) are the endpoints of a line segment. What is the midpoint M of that line segment.

Answers

To find the midpoint M of a line segment with endpoints Q(0,5) and R(2,1), you can use the midpoint formula:

Midpoint M = ((x₁ + x₂) / 2, (y₁ + y₂) / 2)

In this formula:

- (x₁, y₁) are the coordinates of the first endpoint (Q in this case).

- (x₂, y₂) are the coordinates of the second endpoint (R in this case).

Plug in the values:

M = ((0 + 2) / 2, (5 + 1) / 2)

M = (2 / 2, 6 / 2)

M = (1, 3)

So, the midpoint M of the line segment with endpoints Q(0,5) and R(2,1) is (1, 3).

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