The Andes was the mountain range that formed as a result of plate motion around the Ring of Fire.
Answer: The Andes
The full question asks to decide whether the gas was a specific gas. That part is missing in your question. You need to decide whether the gas in the flask is pure helium.
To decide it you can find the molar mass of the gas in the flask, using the ideal gas equation pV = nRT, and then compare with the molar mass of the He.
From pV = nRT you can find n, after that using the mass of gass in the flask you use MM = mass/moles.
1) From pV = nRT, n = pV / RT
Data:
V = 118 ml = 0.118 liter
R = 0.082 atm*liter/mol*K
p = 768 torr * 1 atm / 760 torr = 1.0105 atm
T = 35 + 273.15 = 308.15 K
n = 1.015 atm * 0.118 liter / [ 0.082 atm*liter/K*mol * 308.15K] =0.00472 mol
mass of gas = mass of the fask with the gas - mass of the flasl evacuated = 97.171 g - 97.129 g = 0.042
=> MM = mass/n = 0.042 / 0.00472 = 8.90 g/mol
Now from a periodic table or a table you get that the molar mass of He is 4g/mol
So the numbers say that this gas is not pure helium , because its molar mass is more than double of the molar mass of helium gas.
Answer:
CaCl2
Explanation:
Cacl2 would have greatest freezing point depression because in this case the vant Hoff factor is 2
More will be the value of vant Hoff factor more will be the depression in freezing point when concentration of all electrolyte is same
Given: Acceleration (a) = 9.8 m/s², Initial velocity (u) = 0 m/s and time (t) = 120 s
To find: The distance traveled by Swati (s) =?
Solution: We shall apply 2nd kinematic equation of motion
s = ut + (1/2) at²
or, s = 0×120 + (1/2) × (9.8 m/s²) × (120s)²
or, s = 70,560 m
or, s = 7 km and 560 m
Hence, the required distance travel by her will be 7 km and 560 m.
Answer: a. Hydrofluoric acid
d.sulfuric acid
e. Dihydrogen phospataion
b.hydrobromic acid
c. Nitric acid
Explanation: