CHEMISTRY HIGH SCHOOL

Paige heated 3.00 g mercury (II) oxide (HgO, 216.59 g/mol) to form mercury (Hg, 200.59 g/mol) and oxygen (O2, 32.00 g/mol). She collected 0.195 g oxygen. What was the percent yield of oxygen?

Answers

Answer 1
Answer:

the balanced chemical equation for decomposition of HgO is as follows

2HgO --> 2Hg + O₂

stoichiometry of HgO to O₂ is 2:1

number of HgO moles heated are - 3.00 g / 216.59 g/mol = 0.0139 mol

according to stoichiometry of reaction -

number of O₂ moles formed = 0.0139 mol/ 2 = 0.00695 mol

mass of O₂ to be formed - 0.00695 mol x 32.00 g/mol = 0.2224 g

but the actual yield = 0.195 g

percent yield = actual yield / theoretical yield x 100 %

percent yield = 0.195 g / 0.2224 g x 100 % = 87.7 %

answer is 87.7 %
Answer 2
Answer:

Answer:

The correct answer is 87.8%

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The isotope atoms differ in ?

Answers

An isotope is formed basically when the amount of neutrons are different than the amount of protons in the nucleus. Therefore, we'd get a variation in the atomic mass (number of neutrons and protons). This is what makes isotopes different.

So, the answer would be: Isotope atoms differ in neutrons.

What gives orange juice its acidic qualities ?

Answers

More than half of children between the ages of four and 18 are suffering some degree of tooth erosion, according to the British Dental Association. And fruit juices - particularly orange juice, with its high sugar and acid content - could be a major culprit.But orange juice is still one of the best sources of vitamin C, for both children and adults alike. So what should we do?Nutritionist Sarah Schenker, from the British Nutrition Foundation, says: 'Children are drinking less milk than they used to, and more soft drinks. Although orange juice has a role in a healthy balanced diet, its sugar and acid content lowers the pH of the mouth and makes the teeth more vulnerable to dental plaque.'If you are worried about the effect on teeth, dilute it with water or drink it with food and avoid between meals.' As a guide, there are three types of sugar to look out for in orange juice products.Although all are potentially harmful to the teeth, dentists suggest the safest are the sugars naturally present in the fruit, while juices boosted with artificial sweeteners and added sugars are not as healthy.
Hope it helps but you are not 99 years old
To not give an entire explanation of what befalls kids, in short orange juice has citric acid contained in it which is what gives it its acidic qualities

How many electrons does maganese 55 have?

Answers

Answer:

Maganese 55 has 25 electrons.

Hope this helps you!

Explanation:

The molecular mass of octane is 114.22 g/mol. What is the mass of 22.05 mol of octane?

Answers

In this item, we are asked to calculate for the mass of 22.05 mole of octane given that its molecular mass is equal to 114.22 g/mol. To answer this item, we simply have to multiply the number of moles with the molecular mass. That is, (114.22 g/mol)(22.05 mol) which is equal to 2518.221 grams.
In order to compute the mass of a substance, we may simply mulitply the number of moles of the substance by the molar mass of the substance, since molar mass is mass per mole. Therefore, we get: 114.22 * 22.05 = 2,518.55 grams 2,518.55 grams of octane are present.

What is free-fall acceleration near earth's surface

Answers

free fall is when the only force acting on an object is gravity
Near Earth's surface, the distance between the object that is falling and the center of Earth does not change very much. Thus, the force given by the law of universal gravitation depends only on the mass of the object that is falling.

Which compound has the highest precent composition by mass of strontium? A) SrCl2
B) SrI2
C) SrO
D) SrS

Answers

First find the molar masses of all of the compounds:
SrCl2 = 158.53g/mol
SrI2 = 341.43g/mol
SrO = 103.62g/mol
SrS = 119.68g/mo

Then find the molar mass of Sr in each of the compounds. Since there is only one Sr in every compound, the mass will be the same: 87.62g/mol Sr

Now divide the molar mass of Sr by each of compounds' masses:
SrCl2 = (87.62)/(158.53) = 0.553
SrI2 = (87.62)/(341.43) = 0.257
SrO = (87.62)/(103.62) = 0.846
SrS = (87.62)/(119.68) = 0.732

Now multiply each of the results by 100 to get the percent composition of Sr by mass:
(0.553)(100) = 55.3% Sr in SrCl2
(0.257)(100) = 25.7% Sr in SrI2
(0.846)(100) = 84.6% Sr in SrO
(0.732)(100) = 73.2% Sr in SrS

Thus SrO has the highest percent composition by mass of Sr
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