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3 years ago

Please this is my third time asking this i need some help

Chemistry

1 answer:

AVprozaik [17]3 years ago

6 0

I would say the answer is C, because we know according to the law of conservation of energy that "energy cannot be created or destroyed" but can be conserved and/or converted.

Sorry I couldn't answer sooner, I didn't see your other 2 posts... Hope this helps you ;) -BG

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A balloon filled with helium gas occupies 2.50 L at 25°C and 1.00 atm. When released, it rises to an altitude where the temperat

stira [4]

Answer:

8,19 L

Explanation:

The combined gas law is a equation that can be used when the initial and final conditions -pressure,volume,amount of moles,temperature-, of a gas change during a process. It can be written:

$\frac{P1V1}{n1T1}=\frac{P2V2}{n2T2}$

If the amount of the gas remains constant, then n1=n2 and we have:

$\frac{P1V1}{T1}=\frac{P2V2}{T2}$

For the problem we have:

Note: When working with gases is important to use absolute temperature values (°K, °K=°C+273,15):

P1=1 atm, V1=2,5L, T1=25+273,15=298,15°K

P2=0,3 atm, V2=?, T2=20+273,15=293,15°K

$V2=\frac{P1V1T2}{T1P2}=\frac{1atm*2,5L*293,15K}{298,15K*0,3atm}=8,19L$

The new volume of the balloon is 8,19 L.

5 0

3 years ago

When an object is thrown, the thrower pushes the object. This causes the object to move in a

bija089 [108]

Answer:

Gains Kinetic Energy

Explanation:

Kinetic energy (KE) is the energy inserted on the object in motion. Having gained this energy enerted upon, the body maintains this kinetic energy unless its speed changes.

3 0

3 years ago

Calculate the osmotic pressure of a magnesium citrate laxative solution containing 25.5 g of magnesium citrate in 244 mL of solu

Vera_Pavlovna [14]

Answer:

The answer to your question is π = 12.47 atm

Explanation:

Data

mass of Magnesium citrate = 25.5 g

volume of solution = 244 ml

temperature = 37°C

molar mass C₆H₆MgO₇ = (12 x 6) + (1 x 6) + (24 x 1) + (16 x 7) = 214 g

Osmotic pressure = π = ?

Process

1.- Calculate the moles of magnesium citrate

214 grams ----------------- 1 mol

25.5 grams --------------- x

x = (25.5 x 1)/214

x = 0.119

2.- Calculate molarity

Molarity = moles/volume

Molarity = 0.119/0.244

Molarity = 0.49

3.- Calculate osmotic pressure

π = MRT

π = (0.49)(0.0821)(37 + 273)

π = (0.49)(0.0821)(310)

π = 12.47 atm

7 0

3 years ago

Water is 11.2% by mass hydrogen. How many kilograms of water would contain 5.8 g of hydrogen?

Thepotemich [5.8K]

5.8 is 11.2% of what number

51.786 grams

3 0

4 years ago

Please Help! Thank You

ra1l [238]

Answer:

oooooooooooooooooh i dont know this one

Explanation:

im confuzzled

6 0

3 years ago