Which compound has the highest percent composition by mass of strontium?

Answers

Answer 1

Answer: Assuming all the compounds of interest are given. We proceed on the theoretical way of answering this question. Assume 1 gram of each compound. Multiply it by the reciprocal of the molar mass of the compound. Then multiply it by the molar ratio of the Strontium to the compound. Then, multiply it by the molar mass of strontium. Finally divide this answer by 1 gram and multiply by 100.

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The melting points of canola oil, corn oil, sunflower oil, and peanut oil are 10° C, -11° C, -17° C, and -2° C, If you cool a mixture of these oils to 5°C, which one can you separate easily?a. corn oil b. canola oilc. peanut oild. sunflower oil

A student adds 0.40g of sodium hydroxide to a clean, dry 250 mL beaker and leaves the beaker and leaves the beaker on the lab table. The mass of the empty beaker is 112.58g. After 24 hours, the student observes that the beaker contains a dry, solid white residue. The total mass of the beaker and its contents is 113.09g. Following are three possible chemical reactions that could have occured: Sodium Hydroxide (solid) + Carbon Dioxide (gas) rightarrow Sodium Bicarbonate (solid) Sodium Hydroxide (solid) + Carbon Dioxide (gas) rightarrow Sodium Carbonate (solid) + Water (gas) Sodium Oxide (solid) rightarrow Sodium Oxide (solid) + Water (gas) Use your knowledge of stoichiometry to determine which chemical reaction occurred. Show your work, and explain your reasoning whenever needed.

Answers

2 NaOH (s) + CO₂ (g) → Na₂CO₃ (s) + H₂O (l)

Explanation:

The most probably chemical reaction is:

2 NaOH (s) + CO₂ (g) → Na₂CO₃ (s) + H₂O (l)

Sodium Hydroxide (solid) + Carbon Dioxide (gas) → Sodium Carbonate (solid) + Water (gas)

In this reaction the water you obtain have to be in liquid form because the reaction takes place at room temperature. However because the student left the beaker for 24 hours, the water have a plenty of time to evaporate, so in the end only sodium carbonate (Na₂CO₃) remained in the beaker.

number of moles = mass / molar weight

number of moles of NaOH = 0.4 / 40 = 0.01 moles

Taking in account the chemical reaction, we devise the following reasoning:

if 2 moles of NaOH produce 1 mole of Na₂CO₃

then 0.01 moles of NaOH produce X mole of Na₂CO₃

X = (0.01 × 1) / 2 = 0.005 moles of Na₂CO₃

mass = number of moles × molar weight

mass of Na₂CO₃ = 0.005 × 106 = 0.53 g

mass of Na₂CO₃ = mass of beaker and its contents after 24h - mass of empty beaker

mass of Na₂CO₃ = 113.09 - 112.58 = 0.51 g which is close the theoretical value of 0.53 g.

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how much oxygen would be produced by heating 20 g of mercury (II) oxide if 18.6 g of mercury is produced?

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According to the stoichiometry of the reaction of mercury(II) oxide 1.477 g of oxygen would be produced by heating 20 g of mercury (II) oxide if 18.6 g of mercury is produced.

What is stoichiometry?

Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

433.18 g mercury (II) oxide gives 32 g oxygen thus, 20 g of mercury (II) oxide will produce 20×32/433.18= 1.477 g of oxygen.

Thus, 1.477 g of oxygen would be produced by heating 20 g of mercury (II) oxide if 18.6 g of mercury is produced.

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Hg2O -> O2 + Hg
2Hg2O -> O2 + 2Hg
20g-> ?g + 18.6g
                     (1 molHg2O )      (1 mol O2)          (32g O2)
20g 2Hg2O x -------------------   x ------------------- x -------------- = 0.77g O2
                    (834.36Hg2O)    (1 mol Hg2O)       (1 mol O2)

What is the mass of NH4Cl that must dissolve in 200. grams of water at 50.°C to make a saturated solution?(1) 26 g (3) 84 g
(2) 42 g (4) 104 g

Answers

Answer: It's 104 g

Explanation: yes

at 50ºC:

50 g NH₄Cl----------------- 100 g (H₂O)
? mass NH₄Cl------------- 200 g (H₂O)

mass NH₄Cl = 200 . 50 / 100

mass

Why are units used that are to express the densities of gases different from those used to express the densities of solids or liquids

Answers

If the units for gases were the same as the units for numbers would be too small to be convenient.

For example, the density of iron is 7.87 g/cm³.

Using the same units, the density of hydrogen is 0.000 0899 g/cm³.

It is much more convenient to express the density in numbers that are easier to visualize: 0.0899 g/L, and that is still a small number.

What is global warming? a) a recent increase in the average global temperature near Earth’s surface
b) a period of time when temperatures across the planet are colder than normal
c) a characteristic of summer that returns seasonally
d) the gain of heat in coastal areas from El Niño storms

Answers

Global Warming is a gradual increase in the overall temperature of the earth's atmosphere.

So, i believe the answer to your question would be a) a recent increase in the average global temperatures near Earth's surface

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If a sample of gas in a rigid container has a temperature of 28.1°C at pressure of 121.2kPa.What will the pressure increase to if heated to a temperature of 89.3°C?

Answers

Answer:

3,495.02‬

Explanation: TRY THAT FOR AN ANSWER

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