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Eddi Din [679]
3 years ago
15

HELPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP

Chemistry
1 answer:
Brilliant_brown [7]3 years ago
5 0

Answer: Its the 2nd one

Explanation: A straight horizontal line on a speed-time graph means that speed is constant. It is not changing over time. A straight line does not mean that the object is not moving! This graph shows increasing speed.

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A particular sample of air is 2.5% water vapor express the concentration of water vapor in parts per million
Inessa05 [86]

Answer:

                     25000 ppm

Explanation:

<em>Parts Per Million </em>is defined as the number of parts of a solute per one million parts of a solution.

                  ppm  =  (Weight of Solute / Weight of Solution) × 10⁶   ---(1)

Let us suppose that the air (solution) weights 100 grams, then 2.5 % of water vapors will have following mass,

Mass of Vapors g / 100 g × 100  =  2.5

Or,

Mass of Vapors = 2.5 × 100 / 100

Mass of Vapors  =  2.5 g

Hence, mass of water vapors is 2.5 g.

Now, putting mass of water vapors and air in eq. 1,

                  ppm  =  (2.5 / 100) × 10⁶

                 ppm  =  25000

7 0
3 years ago
ASAP PLEASE
marishachu [46]

Answer:

A

Explanation:

the measure of a system's thermal energy per unit temperature that is unavailable for doing useful work.

8 0
3 years ago
Read 2 more answers
PLSSS HEALP ASAP!!!! WILL REWARD
Liula [17]

A)1.75×3 moles of carbon monoxide

B)2:3

A)each mole of ferric oxide requires 3 moles of carbon monoxide. Therefore 1.75 moles requires 1.75 ×3 moles of carbon monoxide

6 0
2 years ago
The picture is a waning gibbous. What phase will the moon be two weeks later?
SVETLANKA909090 [29]

Answer:

d

Explanation:

5 0
3 years ago
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A 2.950×10−2 M solution of glycerol (C3H8O3) in water is at 20.0∘C. The sample was created by dissolving a sample of C3H8O3 in w
11111nata11111 [884]

Answer:

The molality of the glycerol solution is 2.960×10^-2 mol/kg

Explanation:

Number of moles of glycerol = Molarity × volume of solution = 2.950×10^-2 M × 1 L = 2.950×10^-2 moles

Mass of water = density × volume = 0.9982 g/mL × 998.7 mL = 996.90 g = 996.90/1000 = 0.9969 kg

Molality = number of moles of glycerol/mass of water in kg = 2.950×10^-2/0.9969 = 2.960×10^-2 mol/kg

7 0
3 years ago
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