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Helga [31]
3 years ago
14

Ashley conducts an investigation on the effects of water amounts for seed sprouting

Chemistry
2 answers:
vova2212 [387]3 years ago
6 0
A because she can record
olga_2 [115]3 years ago
3 0
I think it is d. Hope this helps
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A detailed explanation, one paragraph of the colligative property being discussed and why that property changes the way that it
levacccp [35]
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You can do it on the icing of roads, reverse osmosis for desalination of water, dissolved CO2 in soda cans, osmotic pressure involving blood vessels and IV solutions, etc.</span>
6 0
3 years ago
What is the molecular weight for H3PO4
Dominik [7]
<span>H</span>₃<span>PO</span>₄<span> - Phosphoric Acid :

H</span>₃<span>PO</span>₄<span> = 1.0 * 3 + 31.0 + 16.0 * 4 = 98.0 g/mol

hope this helps!</span>
5 0
3 years ago
Hydrogen can be extracted from natural gas according to the following reaction:
evablogger [386]

Answer:

There will be produced 379 grams of H2

The percent yield under these conditions is 7.45 %

Explanation:

Step 1: The balanced equation

CH4(g)+CO2(g) → 2CO(g)+2H2(g)

Step 2: Given data

Kp = 4.5*10²

Temperature = 825 Kelvin

Volume = 85.0 L

Mass of CH4 = 22.3 Kg

Mass of CO2 = 55.4 Kg

Molar mass of CH4 = 16.04 g/mole

Molar mass of CO2 = 44.01 g/mole

Step 3: Calculate moles of CH4

moles of CH4 = mass of CH4 / Molar mass of CH4

moles of CH4 = 22300 / 16.04 = 1390.3

Step 4: Calculate moles of CO2

moles of CO2 = mass of CO2 / Molar mass of CO2

moles of CO2 = 55400 / 44.01 = 1258.80 moles

Step 5: Calculate moles of H2

For 1 mole of CH4 we need 1 mole of CO2 to produce 2 moles of H2

so there will be produced 2*1258.8 = 2517.6 moles of H2

Step 6: Calculate theoretical mass of H2

mass of H2 = Number of moles of H2 * Molar mass of H2

mass of H2 = 2517.6 moles *2.02 g/mole = 5085.552 grams

Step 7: Calculate pressure of CH4

P*V = n*R*T

P =(n*R*T) / V

P = 1390.3*.0821*825/85 = 1107.86atm

Step 8: Calculate pressure of CO2

P*V = n*R*T

P =(n*R*T) / V

P = 1258.80*.0821*825/85 = 1003.08atm

Step 9

Kp= 4.5 *100 =[P(H2)^2 * P(CO)^2]/[P(CO2) * P(CH4)]

450=16X^4/[(1107.86-X)(1003.08-X)]

450=16X^4/[(1107.86)(1003.08)]

(1107.86)(1003.08)*450=16X^4

X = 74.77

We plug this value in for "X" in the ICE chart. Only H2 since thats what the problem wants.

for H2 (2 moles) so 2X = 2*74.77 = 149.54

Step 10: Calculate number of moles of H2

n = P*V/ R*T

n = (149.54 *85 )/(0.0821 * 825) = 187.66 moles H2

Step 11: Calculate mass of H2

mass of H2 = Number of moles H2 * Molar mass of H2

mass of H2 = 187.66 * 2.02 g/moles = 379.07 grams H2 ≈ 379 grams of H2

Step 12: Calculate the yield

(379 grams of H2 / 5085.552 grams of H2 ) * 100 % = 7.45 %

The percent yield under these conditions is 7.45 %

3 0
3 years ago
Which of the following best illustrates a natural process acting as a constructive force
Alina [70]

Answer:

Wind depositing sand to build up sand dunes.

Explanation:

3 0
2 years ago
Arrange the following substances in the order of increasing entropy at 25°C.
iragen [17]

Answer:

In solving this question it is important to note that entropy is referred to as the degree of randomness in a compound or system.

Entropy is highest in gas and lowest in solids

The order is given as:

Gas > Liquid > Solid

Another criteria is the more the elements in a compound, the more the entropy.

For example: KO3 has more entropy than KO2 due to the presence of more elements.

The last criteria is calculating their masses , the one with a greater mass has the higher entropy.

The option with the least entropy will be a solid. Al(s) and NaF(s) are both solids. NaF(s) has more elements in a compound which makes it have a higher entropy than Al(s). This means NaF(s) > Al(s).

The next to consider are the gaseous compounds which are HF(g) , SiF4(g) and SiH4(g). The least entropy will be HF(g) . This is because it has the least number of elements of the 3 compounds.

SiF4(g) and SiH4(g) have equal number of elements in a compound but the one with the highest mass is SiF4(g) because fluorine has a higher mass when compared to hydrogen. This means the compound with the highest entropy is SiF4(g).

The order of increasing entropy is given below:

Al(s) < NaF(s) < HF(g) < SiH4(g) < SiF4(g)

5 0
3 years ago
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