A 2.00 L container of gas has a pressure of 1.00 atm at 300 K. The temperature of the gas is halved to 150K, and the measured pressure of the same 2.00 Liter sample is 0.420 atm. Which of the following is the best explanation for these observations? A. Pressure is proportional to temperature for a fixed volume of gas. B. The molecules of the gas occupy a significant portion of the volume. C. The molecules of the gas have negligible volume of their own. D. The molecules have significant attractive forces at 150 K. E. The gas is closer to an ideal gas at 150 K.
The best explanation for the observation is that, the Pressure is proportional to temperature for a fixed volume of gas. (Option A)
From the question given above, the following data were obtained:
Initial volume (V₁) = 2 L
Initial pressure (P₁) = 1 atm
Initial temperature (T₁) = 300 K
Final temperature (T₂) = 150 K
Final volume (V₂) = 2 L = constant
Final pressure (P₂) = 0.420 atm
From the above, we can see that the volume is constant.
Applying the combine gas equation, we can conclude as follow:
P₁V₁ / T₁ = P₂V₂ / T₂
V₁ = V₂
P₁ / T₁ = P₂ / T₂
P/T = constant
P = constant × T
Thus, we can conclude that the pressure is proportional to the temperature at constant volume. This simply implies that the pressure will increase if the temperature increase and it will also decrease if the temperature decreases.
One way to experimentally measure the heat capacity of a Styrofoam cup calorimeter would be to melt a known mass of ice in warm water and measure hte temperature change. Use the data below to determine the experimental heat capacity of the calorimeter. Use the literature heat of fusion for ice in your calculations. Assume the ice added is at 0.00 c.Mass of ice added: 17.69gMass of water in calorimeter: 98.67gT-Initial of water: 28.7T-Final of water after melting ice: 12.9C
4.88 Cals per degree celsius
We have taken heat of fusion of ice = 80 cals / g
We have taken speciic heat of water = 1 cal/g per degree celsius
In this experiment , let the heat capacity of calorimeter be X.
Heat gained by ice
heat gained in melting + heat gained in getting warmed
= mass x latent heat + mass x specific heat x rise in temperature
= 17.69 x 80 + 17.69 x 1 x ( 12.9 - 0 )
= 1643.4 Cals
Heat lost by water
= mass x specific heat x fall in temperature
98.67 x 1 x ( 28.77 - 12.9 )
= 1565.89 Cals
Heat lost by calorimeter
heat capacity x fall in temperature
X x ( 28.77 - 12.9 )
Heat gained = heat lost
1643.4 = 1565.89 +15.87X
X = 4.88 Cals per degree celsius
Please help!! which oneeeee
b is the correct answer
On average, about ____________ of incoming solar radiation is reflected back to space.A 50% B 30% C 20% D 10%
I believe it B 30% hope that helps
I think it’s B I’m not sure sorry if it’s wrong
What is impossible for a machine to do?A. do a greater amount of work than the amount of work done on the machine B. apply a force in a direction that is different than the direction of the force applied to the machine C. move an object a greater distance than the distance that part of the machine was moved D. apply a force that is less than the force that is applied to the machine
move an object a greater distance than the distance that part of the machine was moved
a, sorry for late answer!!
Models can have the same general appearance as real-ufe objects. True or false
Because its true
All voltmeters have two probes attached to make a measurement explain why you cannot make a voltmeter with a single probe to measure the voltage of a wire
As voltages is a potential in relation to a reference, one probe must be on the reference or "zero" planes and the other must be on the point being measured.
Why does a voltmeter not accurately read voltage?
because the voltmeter uses some of the main circuit's current. Main present in the circuit diminishes as a result, and the voltmeter's reading of the potential difference does not correspond to its true value.
Why are there two probes on a voltmeter?
Nothing is measured at a specific point by the voltmeter. It gauges the voltage (V) differential between two circuit locations. Thus, a multimeter has two leads rather than one.