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3 years ago

First person to answer gets brainliest

Chemistry

1 answer:

Vsevolod [243]3 years ago

8 0

Answer:

It’s the 220k

Explanation: multiply

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If you have 3.0 liters of an unknown gas, at standard temperature and pressure conditions, then you can calculate what about tha

Mariana [72]

We assume it as an ideal gas therefore we can use the ideal gas equation to solve the problem. The ideal gas equation is expressed as PV = nRT. We are given the volume, temperature and pressure. Therefore, we can solve for the amount of the gas in moles.

n = PV / RT
n = 1.00(3L) / (0.08206 atm L/mol K ) 273 K
n = 0.1339 mol

8 0

3 years ago

Which of the following best defines climate)_( Short-term atmospheric conditions of a region Ob The weather pattern of an area o

Marina86 [1]

Answer:

Average weather conditions of a region over the long term

Explanation:

Climate is the long-term average of weather, typically averaged over a period of 30 years. More rigorously, it denotes the mean and variability of meteorological variables over a time spanning from months to millions of years.

4 0

3 years ago

When 8.2 grams of LiBr are dissolved in enough water to create a 150-gram solution, what is the solution's concentration, expres

Dahasolnce [82]

Answer:

5.46% is the percent by mass concentration of the solution.

Explanation:

Mass of LiBr= 8.2 g(Solute)

Mass of solution = 150 g (Solution)

Mass of solution = Mass of solute + Mass of solvent

Mass of solute < Mass of solvent (Always)

Mass of water = 150 g - 8.2 g = 141.8 g (solvent)

Mass percentage is given as:

$\frac{\text{mass of solute}}{\text{mass of solution}}\times 100$

$Mass\%=\frac{8.2 g}{150 g}\times 100=5.46\%$

5.46% is the percent by mass concentration of the solution.

5 0

3 years ago

Which substance has a giant covalent structure and contains atoms of more than one element?A diamondB graphiteC methaneD sand

marysya [2.9K]

which substance has a giant covalent structure and contains atoms of more than one elements?

Explanation:

answer:methane

4 0

3 years ago

October 15, 2018 at 1:49 PM Dioxybenzone is a compound found in sunscreen, and only contains carbon, oxygen, and hydrogen. Analy

-Dominant- [34]

Answer:

Molecular formula for Dioxybenzone is C₁₄H₁₂O₄

Explanation:

Percent composition:

In 100 g of compound → 4.92 g are H

In 100 g of compound → 26.8 g are O

In 100 g of compound → 68.28 g are C

Let's convert the mass to moles by molar mass:

4.92 g / 1 g/mol = 4.92 moles H

26.8 g / 16 g/mol = 1.67 moles O

68.28 g / 12 g/mol = 5.69 moles C

Now we can apply a rule of three:

100 g of compound have 4.92 moles H, 1.67 moles O, 5.69 moles C

244.25 g of compound must have:

(244.25 g . 4.92 m) / 100 g = 12 moles H

(244.25 g . 1.67 m) / 100 g = 4 moles O

(244.25 g . 5.69 m) / 100 g = 14 moles of C

4 0

3 years ago