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Jet001 [13]
3 years ago
5

Help me please cough

Chemistry
1 answer:
Black_prince [1.1K]3 years ago
4 0

Answer:

ur cute btw    

and i think it is the bottom choice

Explanation:

xoxo

hope this helps you

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You have a 25.0 L cylinder of helium at a pressure of 132 atm and a temperature of 19 ∞C. The He is used to fill balloons to a v
8_murik_8 [283]

Answer:

1406 balloons

Explanation:

First of all, we calculate the number of moles of helium gas contained in the 25.0 L cylinder, by using the equation of state for an ideal gas:

pV=nRT

where

p = 132 atm is the pressure

V = 25.0 L is the volume

R=0.082 atm\cdot L / (mol \cdot K) is the gas constant

T=19^{\circ}C+273=292 K is the temperature

Solving for n, we find the number of moles:

n=\frac{pV}{RT}=\frac{(132)(25.0)}{(0.082)(292)}=137.8 mol

Now we can find using the same equation how many moles of gas can be contained in 1 balloons, which has:

V = 2.50 L (volume)

p=732 mm Hg =0.963 atm is the pressure

T=27^{\circ}C+273=300 K is the temperature

Therefore,

n_1 = \frac{pV}{RT}=\frac{(0.963)(2.50)}{(0.082)(300)}=0.098 mol

So, the total number of balloon that can be filled is:

N=\frac{n}{n_1}=\frac{137.8}{0.098}=1406

8 0
4 years ago
Investigate why some element’s symbols derived from their old names.
Gekata [30.6K]

Answer:

you know just in order to bring that nostalgia into chemists minds

Explanation:

3 0
3 years ago
How much energy in joules, does it take to heat a 55 gram sample of ice from-10°C to
Lostsunrise [7]

Energy needed : Q = 1105.5 J

<h3>Further explanation</h3>

Given

mass = 55 g

Temperature from -10°C to 0°C

Required

Energy

Solution

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

Input the value :

Q = 55 g x 2.01 J/g ° C  x (0-(-10))

Q = 1105.5 J

4 0
4 years ago
The atoms of some radioactive isotopes, or radioisotopes, are used in scientific studies. They are called _______.
lys-0071 [83]

Radioactive Isotopes


Hope this helps

7 0
4 years ago
Yo answer my question
igomit [66]

Answer:

C maybe

Explanation:

3 0
3 years ago
Read 2 more answers
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