Answer:
C.
Explanation:
Phase change is physical.
Answer:
The molar mass of the unknown gas is 154.4 g/mol
Explanation:
Step 1: Data given
It takes 986 seconds for an unknown gas to effuse
It takes 811 seconds for chlorotrifluoromethane (CClF3) gas to effuse
Molar mass of chlorotrifluoromethane (CClF3) = 104.46 g/mol
Step 2: Calculate the molar mass of the gas
t1/t2/ √(M1/M2)
⇒with t1 = the time needed for the unknown gas to effuse = 986 seconds
⇒with t2 = the time needed for CClF3 to effuse = 811 seconds
⇒with M1 = the molar mass of the unknown gas = TO BE DETERMINED
⇒with M2 = the molar mass of CClF3 = 104.46 g/mol
986/811 = √(M1/104.46)
(986/811)² = M1 / 104.46
M1 = 154.4 g/mol
The molar mass of the unknown gas is 154.4 g/mol
The answer to this question would be: too low
Molar mass would be determined by the number of mol and the mass of the object. Mass wouldn't be influenced by the temperature, but number of mol is. Using ideal gas formula of PV=nRT you can conlude that the amount of mol(n) is inversely related to the temperature (T).
If the temperature is higher than it supposed to be, then the amount of mol would be lower than it supposed to be.
Alexandra requires a total energy of 1350 kcal for the climb
by eating proteins, fats and carbohydrates the amount of calories per gram contributed varies.
Proteins and carbohydrates - 4 calories per gram
fats - 9 calories and gram
This means that by eating the same mass of fats and proteins/ carbohydrats the calories gained from fats is higher.
each bar contains;
<span>50 g of carbohydrates - 4 calories/g x 50 g = 200 calories
10 g of fat - 9 calories/g x 10 g = 90 calories
40 g of protein - 4 calories/g x 40 g = 160 calories
total amount of calories from 1 bar = 200 + 90 + 160 = 450 calories
energy required = 1 350 000 calories
bars required = 1 350 000/450 = 3000
alexandra should consume 3000 bars </span>
I think the correct answer from the choices listed above is option C. The can <span>from the cupboard will lose carbon dioxide more quickly because it is warmer and gases are less soluble in warmer temperatures. </span> Solubility of gases is a strong function of temperature and as well as pressure.
