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3 years ago

How much more water does it take to

Chemistry

1 answer:

STatiana [176]3 years ago

5 0

Answer:

a) 300 L

b) 100 L

c) 12000 L

Explanation:

a) Amount of water required for 1 kg of Paper = 300 - 400 Kgs or liters

Amount of water water required for 1 Kg of steel = 704.9 L

It takes 300 L more water

b) Amount of water required for 1 kg Potato = 300 liters

It takes 100 L more water

c) Amount of water required for 1 kg Potato = 300 liters

Amount of water required for 1 kg beef = 15,415 liters

It takes 12000 L more water

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g Calculate the time (in min.) required to collect 0.0760 L of oxygen gas at 298 K and 1.00 atm if 2.60 A of current flows throu

lozanna [386]

Answer:

7.67 mins.

Explanation:

Data obtained from the question include the following:

Volume (V) = 0.0760 L

Temperature (T) = 298 K

Pressure (P) = 1 atm

Current (I) = 2.60 A

Time (t) =?

Next, we shall determine the number of mole (n) of O2 contained in 0.0760 L.

This can be obtained by using the ideal gas equation as follow:

Note:

Gas constant (R) = 0.0821 atm.L/Kmol

PV = nRT

1 x 0.0760 = n x 0.0821 x 298

Divide both side by 0.0821 x 298

n = 0.0760 / (0.0821 x 298)

n = 0.0031 mole

Next, we shall determine the quantity of electricity needed to liberate 0.0031 mole of O2.

This is illustrated below:

2O²¯ + 4e —> O2

Recall:

1 faraday = 1e = 96500 C

4e = 4 x 96500 C

4e = 386000 C

From the balanced equation above,

386000 C of electricity liberated 1 mole of O2.

Therefore, X C of electricity will liberate 0.0031 mole of O2 i.e

X C = 386000 X 0.0031

X C = 1196.6 C

Therefore, 1196.6 C of electricity is needed to liberate 0.0031 mole of O2

Next, we shall determine the time taken for the process. This can be obtained as follow:

Current (I) = 2.60 A

Quantity of electricity (Q) = 1196.6 C

Time (t) =?

Q = It

1196.6 = 2.6 x t

Divide both side by 2.6

t = 1196.6/2.6

t = 460.23 secs.

Finally, we shall convert 460.23 secs to minute. This can be achieved by doing the following:

60 secs = 1 min

Therefore,

460.23 secs = 460.23/60 = 7.67 mins

Therefore, the process took 7.67 mins.

7 0

4 years ago

A gas occupies a volume of 40.0 milliliters at 20 c if the volume is increased too 80.0 milliliters at constant pressure, the re

Troyanec [42]

Charles law gives the relationship between temperature and volume of gases. It states that the volume of gas is directly proportional to temperature at constant pressure.
V / T = k
where V - volume and T - temperature in Kelvin and k - constant
$\frac{V1}{T1} = \frac{V2}{T2}$
where parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation
T1 - 20 °C + 273 = 293 K
substituting these values in the equation
$\frac{40.0 mL}{293 K} = \frac{80.0 mL}{T}$
T = 586 K
temperature in celsius = 586 K - 273 = 313 °C
new temperature is 313 °C

8 0

4 years ago

A 1.45 g sample of an iron ore is dissolved in an acid and the iron is obtained as Fe+2 (ag). To titrate the solution, 21.6 mL o

trapecia [35]

Answer:

42.3%

Explanation:

By the reaction given the stoichiometry between MnO₄⁻ and Fe⁺² is 1 mol of MnO₄⁻ to 5 moles of Fe⁺². When KMnO₄ dissolves, it forms the same amount of K⁺ and MnO₄⁻ (1:1:1), so the number of moles of MnO₄⁻ used is:

n = Volume*concentration

n = 0.0216 L * 0.102 mol/L

n = 2.20x10⁻³ mol

1 mol of MnO₄⁻ -------------------- 5 moles of Fe⁺

2.20x10⁻³ mol ---------------------- x

By a simple direct three rule

x = 0.011 mole

The molar mass of iron is 55.8 g/mol. The mass is the molar mass multiplied by the number of moles, thus:

m = 55.8*0.011

m = 0.614 g

Then, the percent of iron in the ore is:

(mass of iron/ mass of ore) *100%

(0.614/1.45)*100%

42.3%

3 0

3 years ago

Which of the following is true about extinction? A. Only one extinction has occurred during the Earth's history. B. Plant specie

ycow [4]

Answer:

C. Extinctions have occurred many times throughout the Earth's history.

Explanation:

8 0

3 years ago

Read 2 more answers

How do you find out how many protons,electrons, and neutrons an atom has?

Evgen [1.6K]

So the atomic number is the same as protons, and electrons and to get neutrons by subtracting number of protons from atomic mass.

8 0

3 years ago