Density Lab B

[NewSciolyer]

Okay I'll post a few:

1) How is molality affected by temperature?

2) A sample of gas occupies a volume of 11.1 L at 1.23 atm and 0.0 degrees Celsius. What volume does the sample of gas occupy at 3.15 atm and 100.0 degrees Celsius?

3)All of the below are types of densities except:
a) Mass density
b) Number density
c) Area density
d Volume density

1) Molality is not affected by temperature
2) 5.92 L
3) d-Volume density

Correct! Your turn!

[waterboy]

1) A bronze alloy is made of two metals. Tin makes up about 12% of the alloy with a density of 7.365g/cm^3 and the copper makes up the rest with a density of 8.96g/cm^3. What is the density of bronze using these numbers?

2) A 4-gram sugar cube (sucrose: C12H22O11) is dissolved in a 350-milliliter cup of hot water. Find the molarity of the sugar solution.

3) 6200 mL of an ideal gas is contained at 3.0 atm and 37 °C. How many moles of this gas are present?

[azboy1910]

1) A bronze alloy is made of two metals. Tin makes up about 12% of the alloy with a density of 7.365g/cm^3 and the copper makes up the rest with a density of 8.96g/cm^3. What is the density of bronze using these numbers?

2) A 4-gram sugar cube (sucrose: C12H22O11) is dissolved in a 350-milliliter cup of hot water. Find the molarity of the sugar solution.

3) 6200 mL of an ideal gas is contained at 3.0 atm and 37 °C. How many moles of this gas are present?

1) 8.77 g/cm^3 (3 significant figures)
2) 0.0334 M (3 significant figures)
3) 0.73 moles (2 significant figures)

[waterboy]

Correct! Your turn.

[Dwu1011]

Ok so I'll just go, since nobody else wants to go.
A rigid balloon of negligible mass has a volume of 0.32 m3 and has been evacuated. Argon gas is pumped into the balloon at a rate of 0.05 m3/s. The density of Argon gas is 1.784 g/L and the density of air is 1.23 g/L. How long until the balloon begins to sink?

[waterboy]

Ok so I'll just go, since nobody else wants to go.
A rigid balloon of negligible mass has a volume of 0.32 m3 and has been evacuated. Argon gas is pumped into the balloon at a rate of 0.05 m3/s. The density of Argon gas is 1.784 g/L and the density of air is 1.23 g/L. How long until the balloon begins to sink?

Not sure if this is correct
15 seconds

[Fallsbury]

Is the balloon filled with nothing or with air in the beginning, bc if it were filled with air wouldn't it just sink immediately?

[Fallsbury]

@waterboy i dont think that the answer is right bc 15 seconds would fill up 0.75 m3 of the balloon which has a rigid shape and volume of 0.32 m3. I got around 4.41 seconds. I dont know how to hide my answer but dont grill me cuz its probably wrong anyway

[AstroKing]

Hi Fallsbury!!!!!

[Dwu1011]

@waterboy i dont think that the answer is right bc 15 seconds would fill up 0.75 m3 of the balloon which has a rigid shape and volume of 0.32 m3. I got around 4.41 seconds. I dont know how to hide my answer but dont grill me cuz its probably wrong anyway

Yup! 4.41 seconds is correct! your turn.