Answer: e. none of these
Explanation:
Mass percent is the ratio of mass of solute dissolved to the mass of solution in terms of percentage.
Thus 71.0% means 71.0 g of
is present in 100 g of solution
To calculate the number of moles, we use the equation:
given mass of = 71.0 g
Molar mass of = 63.01 g/mol
Putting in the values we get:
Thus there are 1.13 moles of
Answer:
The pressure of the gas at 23 C is 179.92 kPa.
Explanation:
Gay-Lussac's law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of collisions with the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.
In short, when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases.
Gay-Lussac's law can be expressed mathematically as follows:
Studying two states, one initial 1 and the other final 2, it is satisfied:
In this case:
Replacing:
Solving:
P2= 179.92 kPa
<u><em>The pressure of the gas at 23 C is 179.92 kPa.</em></u>