Weight of sodium thiosulfate = 76.148 - 8.2
= 67.948 g.
Concentration of the solution = 67.948 / 172.7
= 0.393 g / mL. to the nearest thousandth . (answer).
Answer:
mass number
Explanation:
The sum of the protons and neutrons in an atom equals the mass number of such an atom.
- Mass number is the mass of an atom.
- The mass of an atom is concentrated in the nucleus
- The particles in the nucleus are the protons and neutrons.
So;
Mass number = number of protons + number of neutrons.
Answer : The mole fraction of the non-volatile solute in the solution is 0.195
Explanation :
According to the relative lowering of vapor pressure, the vapor pressure of a component at a given temperature is equal to the mole fraction of that component of the solution multiplied by the vapor pressure of that component in the pure state.
Formula used :
where,
= vapor pressure of the pure solvent (acetone) = 266 torr
= vapor pressure of the solution = 214 torr
= mole fraction of solute = ?
Now put all the given values in the above formula, we get:
Therefore, the mole fraction of the non-volatile solute in the solution is 0.195
During most processes, energy is exchanged between the system and the surroundings. If the system loses a certain amount of energy, that same amount of energy is gained by the surroundings. ... for an exothermic process is negative because the system is losing heat.
It would take 8 antacid tablets to produce 120 mL of CO2 gas.
