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

Answers

Answer 1

Answer: 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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What are 3 reasons scientist found Rutherford's nuclear atomic model to be fundamentally incomplete

Answers

The three reasons that scientists found Rutherfor's nuclear atomic model to be fundamentally incomplete are as follows:
Number 1) according to Rutherford, the electrons revolve in completelycircular orbits. However, if this was true the charged electron wouldsimply fall into the nucleus after losing energy.
Number 2)According to Rutherford's model, the nucleus itself only consisted ofprotons. However, as we now know due to research in quantum mechanics,if this was true this would make the atom unstable due to the cycle ofattraction and repulsion.
Number 3) The neutrons which have alsobeen discovered since to be an important part of the atom, are notmentioned at all in Rutherford's model.

The correct answer is:

1.how electrons are organized in a cloud

2. why electrons are not attracted into the positively charged nucleus

3. variations in chem behavior between elements

Explanation:

Rutherford reversed Thomson's model in 1911 with his popular gold foil research in which he confirmed that the atom has a tiny and massive nucleus. Rutherford created an experiment to practice the alpha particles released by a radioactive element as probes to the underground world of atomic structure.

A 10.0 mL syringe contains 0.10 g of nitrogen gas at 0.0 degrees Celsius. What is the pressure inside the syringe?

Answers

Since the sample inside the syringe is a gas, we assume that it is an ideal gas that is we use the expression PV = nRT. We can easily calculate the pressure as follows:

n = m /MM = 0.10 / 28 = 0.0036 mol

P = nRT / V = 0.0036(0.08206)(273.15) / 0.010
P = 8 atm

Answer:

The correct answer is 8.0 atm.

Given the boiling point of water which is 81 degrees Celsius, calculate the atmospheric pressure.

Answers

The problem ask to calculate of find the atmospheric pressure of water having a boiling point of 81 degree. Base on my calculation i came up with an answer of 292 mm HG. I hope you are satisfied with my answer and feel free to ask for more if you have clarification and question

Which formulas represent one ionic compound and one molecular compound?

Answers

ionic compounds lose or gain electrons to become stable.
ionic compounds are bonds between metals and nonmetals.

molecular or covalent compounds share one or more electrons to become stable.
molecular or covalent compounds are bonds between nonmetals.

Final answer:

An example of an ionic compound is sodium chloride (NaCl). An example of a molecular compound is carbon dioxide (CO2).

Explanation:

One example of an ionic compound is sodium chloride (NaCl), where sodium (Na) is a metal that forms a positively charged ion and chlorine (Cl) is a nonmetal that forms a negatively charged ion. The formula for a molecular compound is represented by carbon dioxide (CO2), where carbon (C) and oxygen (O) atoms share electrons to form covalent bonds.

Learn more about Ionic and molecular compounds here:

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What 2 pieces of equipment will you use to separate the salt from the water?

Answers

Separate Salt and Water Using Distillation

If you want to collect the water, you can use distillation. This works because salt has a much higher boiling point than water. One way to separate salt and water at home is to boil the salt water in a pot with a lid.

hope this helps!!

Final answer:

To separate salt from water, you can use evaporation or filtration.

Explanation:

To separate the salt from the water, you can use the processes of evaporation and filtration.

Evaporation: You can heat the saltwater solution to boil off the water and leave behind the salt as solid crystals. The water evaporates and can be collected as a vapor if desired.
Filtration: Alternatively, you can use a filter to separate the solid salt particles from the liquid water. The saltwater solution is poured through the filter, which traps the salt while allowing the water to pass through.