At room temperature (20°C) and pressure, the density of air is 1.189 g/L. An object will float in air if its density is less tha
1 answer:
Total density of filled ball with hydrogen gas:
The relationship between mass and volume can be easily determined using density; for example, the mass of a body is equal to its volume multiplied by the density (M = Vd), whereas the volume is equal to the mass divided by the density (V = M/d). The ball filled with hydrogen will float in the air because total density of filled ball is lessor than the density of an air.
Density of hydrogen gas =
Mass of the hydrogen gas :
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<u>Answer:</u> The enthalpy change of the reaction is -361.6 kJ
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
Moles of sodium = 0.025 moles
Molar mass of sodium = 23 g/mol
Putting values in above equation, we get:
We are given:
Mass of water = 100.00 g
Mass of sodium = 0.575 g
Mass of solution = 100.00 + 0.575 = 100.575 g
To calculate the amount of heat absorbed, we use the equation:
where,
q = amount of heat absorbed = ?
m = mass of solution = 100.575 g
C = specific heat capacity of solution = 4.18 J/g°C
= change in temperature =
Putting all the values in above equation, we get:
When heat is absorbed by the solution, this means that heat is getting released by the reaction.
<u>Sign convention of heat:</u>
When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.
For the given chemical reaction:
When 0.025 moles of sodium is reacted, the heat released by the reaction is 4.52 kJ
So, when 2 moles of sodium will react, the heat released by the reaction will be =
Hence, the enthalpy change of the reaction is -361.6 kJ