Answer:
94.3g/mol
Explanation:
Step 1:
Data obtained from the question. This includes the following:
Mass of the gas = 3g
Volume (V) = 1L
Temperature (T) = 100°C
Pressure (P) = 740torr
Molecular weight of the gas =..?
Step 2:
Conversion to appropriate unit.
For temperature:
T(K) = T(°C) + 273
T(°C) = 100°C
T(K) = 100°C+ 273
T(K) = 373K
For Pressure:
760torr = 1atm
Therefore, 740torr = 740/760 = 0.974 atm
Step 3:
Determination of the number of mole of the gas.
The number of mole of the gas can be obtained by using the ideal gas equation as illustrated below:
PV = nRT
Volume (V) = 1L
Temperature (T) = 373K
Pressure (P) = 0.974atm
Number of mole (n) =..?
Gas constant (R) = 0.0821atm.L/Kmol
PV = nRT
Divide both side by RT
n = PV / RT
n = 0.974 x 1 / 0.0821 x 373
n = 0.0318 mole
Step 4:
Determination of the molecular weight of the gas. This can be obtained as shown below:
Mass of gas = 3g
Number of mole of gas = 0.0318 mol
Molecular weight =?
Molecular weight = Mass /number of mole
Molecular weight of the gas = 3/0.0318
Molecular weight of the gas = 94.3g/mol
Answer:
The formula of the compound is Cu₂O.
Explanation:
From the question given above, the following data were obtained:
Mass of compound = 12.5 g
Mass of copper (Cu) = 11.1 g
Mass of oxygen (O) = 1.4 g
Formula of compound =?
The formula of the compound can be obtained as follow:
Cu = 11.1 g
O = 1.4 g
Divide by their molar mass
Cu = 11.1 / 63.5 = 0.175
O = 1.4 / 16 = 0.0875
Divide by the smallest
Cu = 0.175 / 0.0875 = 2
O = 0.0875 / 0.0875 = 1
Therefore, the formula of the compound is Cu₂O.
Answer:
D) Previous models
Got it right on USTestPrep
She should make soup. When you are way above sea level, the atmospheric pressure decreases. Boiling starts when the vapor pressure of the liquid is the same with the atmospheric pressure. This would mean that water boils at a much lower temperature than the usual 100deg C. So it would take longer for the components in the soup to cook compared to when it is cooked on the foot of the mountain.
Answer:
I'd say it's the number of water drops.
Explanation:
The number of water drops is what you're controlling or purposely controlling and that answer choice makes the most sense out of the other answer choices. So I'd say it's "The Number of Water Drops."
