Calculate the density of NO2 gas?
Density = (Pressure)(Molar Mass)/(R)(Temperature) I forget exactly what R is called, but it is a constant. So, you get (.970)(46)/(.0821)(308). Your final answer is 1.76456. Round to as many decimal places as your teacher prefers.
Calculate the density of sulfur hexafluoride (SF6) gas?
Use the ideal gas law! PV = nRT PV = (mass / molar mass)RT PV/RT = mass / molar mass PV(molar)/RT = mass P(molar)/RT = mass/V Recall that density = mass / volume: P(molar)/RT = d We can now find the density. I'll use R as 0.0821 Latm/molK. (2.77 atm)(146.06 g/mol) / (0.0821)(728 K) = d 6.77 g/L = d (Answer) Hope this helps!
If air is heated in a sealed container what will be change in density?
None. You see density = [math]mass/volume[/math] You must know that mass cannot change as the container is sealed, so no molecules can leak out. You must also that volume of the container is constant. So, when mass and volume are same as they were before heating, then does density changes after heating? No!!BUT, I think what made you confuse here was the thought that air becomes less dense on heating, but that is valid of open spaces, because the air can expand to the extent it wants to.The things changing here is the kinetic energy of the molecules of air and their temperature, the pressure inside the container. :)
Does the density of liquid change with the shape of a containter?
to calculate density : density = mass/volume <--- volume of the liquid NOT container so no matter what container u use, for the same amount of liquid, the density is ALWAYS constant IF u measure it at the same temperature and pressure. at different temperature and pressure, it might be slightly different eg: water at 4 degree celcius, it's density is slightly lower~
How temperature is related to density?
As a common rule of thumb, for most pure liquids temperature is inversely proportional to the density. That is, temperature rise lowers the density, and lowering temperature will increase density. This rule is true for all liquids that shrinks on solidification with exception of water, which expands on solidification. Therefore, if you lower water’s temperature, it’s density will increase until temperature reaches to 4 Deg C. After that water’s density falls as it freezes at 0 Deg C. That’s why ice floats in water because it’s lighter than water.
Does changing the volume of a container filled with gas change the mass of the gas?
Provided the container is sealed, the mass remains constant. The relationship between density, mass, and volume is expressed as d=m/v. Change any one of those variables, and at least one of the other ones will change too. In a sealed container, the number of molecules of gas is constant, so the mass remains constant regardless of changes in pressure or temperature.