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3 years ago

What is the chemical formula for the compound formed between strontium and oxygen?

Chemistry

1 answer:

Oduvanchick [21]3 years ago

6 0

Answer:

SrO = Strontiumoxide

Explanation:

Strontium is an element part of group 2. This means it has 2 electrons on the outer shell. This gives Strontium a positve electronic charge of +2.

Oxygen is an element, part of group 16. This means it has 6 electrons on the outer shell. To get the stable noble gas configuration, it needs 2 more electrons. This gives oxygen a negative electronic charge of -2.

This means 1 strontium atom can bind to 1 oxygen atom. To form Strontiumoxide (SrO).

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Select the correct answer. The gas in a sealed container has an absolute pressure of 9.25 atmospheres. If the air around the con

N76 [4]

Answer:

Explanation:

8.25 atm

7 0

3 years ago

Read 2 more answers

Convert 7.50 mol of Li₂O to grams

Natali5045456 [20]

Answer:

223.5 g

Explanation:

The formula between the number of moles, mass and Mr can be used to convert moles to grams.

<em>Number of moles = mass ÷ Mr</em>

So, mass = number of moles × Mr

Mr of Li₂O = (6.9 × 2) + 16 = 29.8

∴ Mass = 7.5 × 29.8 = <u>223.5 g</u>

4 0

2 years ago

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. how much calcium is contained in 45.0 g of c

kolbaska11 [484]

In a sample of pure calcium fluoride of mass 15.0 g, 7.70 g of calcium is present. First convert the mass into number of moles as follows:

$n=\frac{m}{M}$

Here, m is mass and M is molar mass.

Molar mass of Ca is 40 g/mol, putting the values,

$n=\frac{7.70 g}{40 g/mol}=0.1925 mol$

Similarly, molar mass of $CaF_{2}$ is 78.07 g/mol thus, number of moles will be:

$n=\frac{15.0 g}{78.07 g/mol}=0.1921 mol$ .

Thus, 0.1921 mol of $CaF_{2}$ have 0.1925 mol of Ca, or 1 mole of $CaF_{2}$ will have approximately 1 mole of Ca.

Now, mass of Ca needs to be calculated in 45.0 g of $CaF_{2}$ . Converting mass into number of moles first,

$n=\frac{45.0 g}{78.07 g/mol}=0.5764 mol$

Thus, number of moles of Ca will also be 0.5764 mol, converting number of moles into mass,

$m=n\times M=0.5764 mol\times 40 g/mol=23.06 g$

Therefore, mass of Ca will be 23.06 g.

6 0

3 years ago

Calculate the change in entropy if Br2(l) is converted to Br2(g).

Alik [6]

Ans: The entropy change for the given reaction is 93.3 J/K

Given reaction:

Br2(l) → Br2(g)

ΔS = ∑n(products)S⁰(products) - ∑n(reactants)S⁰(reactants)

= 1 mole* S°(Br2(g)) - 1 mole*S°(Br2(l))

= 1 mole *245.5 J/mol-K - 1 mole*152.2 J/mol-K

= 93.3 J/K

5 0

3 years ago

What occupations may light and sound be involved in and what branch of science is their study?

Maslowich

Explanation:

Physics: The study of matter and energy and the interactions between them. Physicists study such subjects as gravity, light, and time.

The question is a bit confusing but here i go..

6 0

2 years ago