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Lesechka [4]
3 years ago
5

How many grams of potassium carbonate are needed to make 300ml of a 4.5M solution?

Chemistry
1 answer:
kenny6666 [7]3 years ago
4 0

Answer:

186.3g

Explanation:

4.5moles of K₂CO₃  is in 1000ml

? moles of K₂CO₃ is in 300 ml

(4.5 × 300)/ 1000 = 1.35 moles of K₂CO₃

1 mole of K₂CO₃ = (39 × 2) + 12 + (16 × 3) = 78 + 12 + 48 = 138g

1.35 moles of K₂CO₃  = ?

= (1.35 × 138)/1 = 186.3g

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You have 41.6 g of O2 gas in a container with twice the volume as one with CO2 gas in another container. The pressure and temper
prisoha [69]

Answer:

The mass of carbon dioxide is 28.6 grams

Explanation:

<u>Step 1:</u> Data given

Mass of O2 = 41.6 grams

Volume of the O2 container = 2V

Volume of the CO2 container = V

Pressure and temperature are the same

<u><em>Step 2:</em></u> Ideal gas law

The ideal gas law = p*V=nRT

For O2: p*2V = n(O2)*R*T

For CO2: p*V = n(CO2)*R*T

n(O2)*R*T / P*2V = n(CO2)*R*T / P*V

Since P, R and T are contstant, we can simplify this to:

n(O2)/2 = n(CO2)

<u>Step 3:</u>  Calculate moles of O2

Moles O2 = mass O2/ Molar mass O2

Moles O2 = 41.6 grams / 32 g/mol

Moles O2 = 1.3 mol O2

The number of moles CO2 = 0.65 mol

Mass of CO2 = Moles CO2 * Molar Mass CO2

Mass of CO2 = 0.65 mol * 44.01 g/mol

Mass of CO2 = 28.6 grams

The mass of carbon dioxide is 28.6 grams

5 0
4 years ago
How can water affect the rock cycle?
Ilia_Sergeevich [38]

Answer:

b

Explanation:

b because it's a physical change

6 0
3 years ago
The function of ribosomal RNA (rRNA) is
mr Goodwill [35]

Answer:

Its responsible for the process known as translation, or the process our cells use to make proteins.They are also responsible for reading the order of Amino acids and linking them together.

Hope it helps!

6 0
3 years ago
You are looking at two samples of iron. One sample is very small and came from the red soil on the planet Mars. The other sample
aivan3 [116]
The two samples don’t contain different atoms so it will be false
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What is the correct noble gas configuration for sr?
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Sr has an atomic number of 38 so we'll start there.

The closest noble gas is Kr with an atomic number of 36 so it'll look like this:

[Kr]5s^2.

3 0
4 years ago
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