Answer:
50 mph
Explanation:
To figure out how many miles per hour this car is going, we divide the distance traveled by the time it took.
200 ÷ 4 = 50
The problem can be solved using the following formula:
ΔTb = i Kb <em>m</em>
i = moles particles/moles solute
Kb = 0.512 °C/m
m = molality = moles solute/kg solvent
First we can solve for the molality of the solution:
75.0 g ZnCl₂ / 136.286 g/mol = 0.550 mol ZnCl₂
m = 0.550 mol/0.375 kg
m = 1.468 mol/kg
We can now solve for the change in temperature of the boiling point:
ΔTb = i Kb m
ΔTb = (3 mol particles/1 mol ZnCl₂) (0.512 °C/m) (1.468 m)
ΔTb = 2.25 °C
The boiling point of a solution is the initial boiling point plus the change in boiling point:
BP = 100 °C + 2.25 °C
BP = 102.25 °C
The solution will have a boiling point of 102.25 °C.
I do believe the answer would be B. the flashlight represents the sun, the basketball represents the earth and the smaller softball would be the moon.
hope this helps
Answer:
the answer is Sodium (Na)
Let's assume that H₂ gas has ideal gas behavior.
Then we can use ideal gas formula,
PV = nRT
Where,
P = Pressure of the gas (Pa)
V = Volume of the gas (m³)
n = moles of the gas (mol)
R = Universal gas constant (8.314 J K⁻¹ mol⁻¹)
T = Temperature in Kelvin (K)
But,
n = m/M,
Where m is mass of the gas (kg) and M is molar mass of the gas (kg/mol)
Hence PV= mTR / M
P = mTR / VM = (m/V)TR / M
m/V = d (density (kg/m³)
By rearranging,
P = dRT / M
d = 0.135 g/L = 0.135 kg/m³
T = (273 + 201) K = 474 K
M = 2 g/mol = 2 x 10⁻³ kg/mol
From substitution,
P = 0.135 kg/m³ x 8.314 J K⁻¹ mol⁻¹ x 474 K / 2 x 10⁻³ kg/mol
P = 266006.43 Pa
P = 266 kPa
Hence the pressure of H₂ gas at 201⁰C is 266 kPa
