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Nata [24]
3 years ago
5

How many oxygen atoms are in 2.80 g of quartz?

Chemistry
1 answer:
disa [49]3 years ago
4 0
The chemical formula for quartz is SiO₂
Percentage by mass of oxygen = (2 x 16) x 100 / (28 + 2 x 16)
Percentage by mass of oxygen = 53.3%

Mass of oxygen in sample = 0.533 x 2.8
Mass of oxygen = 1.49 grams

Moles of oxygen = 1.49 / 16
Moles = 0.093

One mole contains 6.02 x 10²³ particles
Thus, the atoms of oxygen:
0.093 x 6.02 x 10²³ 
= 5.6 x 10²²
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Why does chlorine displace bromine from potassium bromide solution
Nataliya [291]

Answer:

A more reactive halogen displaces a less reactive halogen from a solution of one of its salts.

Chlorine is more reactive than bromine, thus it displaces bromine.

4 0
3 years ago
0.10 mol of argon gas is admitted to an evacuated 50 cm3 container at 20°C. The gas then undergoes heating at constant volume to
dolphi86 [110]

<u>Answer:</u> The final pressure of the gas is 9.41 atm

<u>Explanation:</u>

To calculate the pressure of the gas, we use the equation given by ideal gas equation:

PV=nRT

where,

P = pressure of the gas = ?

V = Volume of gas = 50cm^3=0.05L    (Conversion factor:  1L=1000cm^3 )

n = Number of moles = 0.01 mol

R = Gas constant = 0.0821\text{ L atm }mol^{-1}K^{-1}

T = temperature of the gas = 300^oC=[300+273]K=573K

Putting values in above equation, we get:

P\times 0.050L=0.01\times 0.0821\text{ L atm }mol^{-1}K^{-1}\times 573K\\\\P=\frac{0.01\times 0.0821\times 573}{0.05}=9.41atm

Hence, the final pressure of the gas is 9.41 atm

5 0
4 years ago
Compare and contrast carbon dioxide and water.
Masja [62]
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5 0
3 years ago
Which produces the greatest number of ions when one mole dissolves in water?
Arada [10]
~Hello there!

Your question: Which produces the greatest number of ions when one mole dissolves in water?

Your answer: Na2SO4<span> can dissociate into three ions, whereas the other choices produce only two ions (or in the case of sucrose, none) when dissolved in water.

Any queries ^?

Happy Studying!
</span>
7 0
4 years ago
What are the genotypes and phenotypes of the offspring in this image?
soldier1979 [14.2K]

Answer:

Genotypes: Hh, Hh, hh, and hh

Phenotypes: Short Hair, Short Hair, Long Hair, Long Hair

Have a nice day! ^-^

6 0
3 years ago
Read 2 more answers
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