Identify three factors that characterize aquatic systems
1 answer:
You might be interested in
Answer : The number of ice cubes melt must be, 13
Explanation :
First we have to calculate the mass of water.
Density of water = 1.00 g/mL
Volume of water = 650 mL
Now we have to calculate the heat released on cooling.
Heat released on cooling =
where,
m = mass of water = 650 g
c = specific heat capacity of water =
= final temperature =
= initial temperature =
Now put all the given values in the above expression, we get:
Heat released on cooling =
Heat released on cooling = 78793 J = 78.793 kJ (1 J = 0.001 kJ)
As, 1 ice cube contains 1 mole of water.
The heat required for 1 ice cube to melt = 6.02 kJ
Now we have to calculate the number of ice cubes melted.
Number of ice cubes melted =
Number of ice cubes melted =
Number of ice cubes melted = 13.1 ≈ 13
Therefore, the number of ice cubes melt must be, 13
Answer:
1223.38 mmHg
Explanation:
Using ideal gas equation as:
where,
P is the pressure
V is the volume
n is the number of moles
T is the temperature
R is Gas constant having value =
Also,
Moles = mass (m) / Molar mass (M)
Density (d) = Mass (m) / Volume (V)
So, the ideal gas equation can be written as:
Given that:-
d = 1.80 g/L
Temperature = 32 °C
The conversion of T( °C) to T(K) is shown below:
T(K) = T( °C) + 273.15
So,
T = (32 + 273.15) K = 305.15 K
Molar mass of nitrogen gas = 28 g/mol
Applying the equation as:
P × 28 g/mol = 1.80 g/L × 62.3637 L.mmHg/K.mol × 305.15 K
⇒P = 1223.38 mmHg
<u>1223.38 mmHg must be the pressure of the nitrogen gas.</u>