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Delvig [45]
2 years ago
14

About 3% of the water on Earth is freshwater. Only about 40% of that freshwater is available for human use. Why is so much fresh

water unavailable for human use? A) It is frozen. B) It is polluted. C) It is salt water. D) It is in aquifers. 2) The deepest place in the seafloor is called the A) abyssal plain. B) Marianas Trench. C) Aleutian Trench. D) hydrothermal vent. 3) Tides are caused by A) gravity. B) heat. C) waves. D) winds.
Chemistry
2 answers:
Ilya [14]2 years ago
3 0
I believe the answer you're looking for is B. It's Polluted. I hope this helps.
devlian [24]2 years ago
3 0

<u>These are the correct answers you guys can definitely trust me on:</u>

<u>#1. It is frozen, when we need it, people with cut it out</u>

<u>#2. The deepest part of the ocean in the Mariana's Trench</u>

<u>#3. Gravity: Tides are caused by the gravitational interaction between the Earth and the Moon. The gravitational attraction of the moon causes the oceans to bulge out in the direction of the moon. </u>

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Five gases combined in a gas cylinder have the following partial pressures: 3. 00 atm (N2), 1. 80 atm (O2), 0. 29 atm (Ar), 0. 1
Helen [10]

The total pressure of the gaseous mixture has been 5.37 atm. Thus, option D is correct.

The partial pressure has been defined as the pressure exerted by each gas in the mixture.

According to the Dalton's law of partial pressure, the total pressure of gas has been the sum of the partial pressure of the gases in the mixture.

The given partial pressure of gases in the mixture has been:

  • Partial pressure of Nitrogen, P_N_2=3\;\rm atm
  • Partial pressure of Oxygen, P_O_2=1.80\;\rm atm
  • Partial pressure of Argon, P_A_r=0.29\;\rm atm
  • Partial pressure of Helium, P_H_e=0.18\;\rm atm
  • Partial pressure of Hydrogen, P_H=0.10\;\rm atm

The total pressure of the gaseous mixture has been:

P=P_N_2\;+\;P_O_2\;+\;P_A_R\;+\;P_H_e\;+\;P_H\\P=3\;+\;1.80\;+\;0.29\;+\;0.18\;+\;0.10\;\text {atm}\\P=5.37\;\rm atm

The total pressure of the gaseous mixture has been 5.37 atm. Thus, option D is correct.

For more information about partial pressure, refer to the link:

brainly.com/question/14623719

7 0
2 years ago
A copper cube has a mass of 420g and takes up 50.4cm^3 what is the density?
AURORKA [14]
Use the equation d = m/v or density equals mass over volume. 420/50.4=8.3333 or 8 and one third.
6 0
3 years ago
A car burns octane in the following balanced reaction: 2C8H18 + 25O2 -&gt; 16CO2 + 18H2O. If the car burns 500 grams of octane,
Lerok [7]

Answer:

The answer to your question is 1544 g of CO₂

Explanation:

Data

mass of octane = 500 g

mass of CO₂ = ?

Balanced chemical reaction

               2C₈H₁₈  +  25O₂   ⇒    16CO₂   +   18H₂O

Process

1.- Calculate the molar mass of octane and of carbon dioxide

C₈H₁₈ = 2[(12 x 8) + (1 x 18)] = 2[(96 + 18] = 2[114] = 228 g

CO₂ = 16[(12 x 1) + (16 x 2)] = 16[12 + 32] = 16[44] = 704 g

2.- Calculate the mass of carbon dioxide produced

                    228 g of C₈H₁₈ ---------------- 704 g of CO₂

                     500 g of C₈H₁₈ ---------------  x CO₂

                              x = (500 x 704) / 228

                              x = 352000/228

                              x = 1544 g of CO₂

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