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inysia [295]
2 years ago
5

Helpppppppppppp me pleaseeeeeee​

Chemistry
1 answer:
Cloud [144]2 years ago
4 0

Answer:

VX a small town called to the highest frequency and I wla kmo the

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When the temperature of a rigid hollow sphere containing 685 L of helium gas is held at 621 K, the pressure of the gas is 1.89 x
Leno4ka [110]
You have to use the equation PV=nRT.
P=pressure (in this case 1.89x10^3 kPa which equals 18.35677 atm)
1V=volume (in this case 685L)
n=moles (in this case the unknown)
R=gas constant (0.08206 (L atm)/(mol K))
T=temperature (in this case 621 K)
with the given information you can rewrite the ideal gas law equation as n=PV/RT.
n=(18.35677atm x 685L)/(0.08206atmL/molK x 621K)
n=246.8 moles
8 0
2 years ago
Which overall chemical equation is obtained by combining these intermediate equations?
Juli2301 [7.4K]
The common substance among the product(s) of the first equation and among the reactant(s) in the second equation is H2O(g). We can eliminate that as an intermediate. The overall chemical equation will thus be:

CH4(g) + 2O2(g) → CO2(g) + 2H2O(l),

which is the first answer choice.

In essence, all you’re doing here is swapping water vapor for liquid water.
5 0
2 years ago
Use the periodic table to select which type of bond is present and which of the listed properties is most
Kazeer [188]

Answer:

A= Metallic

B= Conducts electricity as a solid

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Why is hydrogen a light gas and iron is a heavy solid
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<span>Heavier atoms make denser materials</span>
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