Answer:
1 mole of MgO contains Avogadro's number of molecules which is 6.023×10^23
molecules.
0.5 mole of MgO will contain 0.5×6.023×10^23
=3.0115×10^23 molecules
Answer:
(a). With fewer molecules in the container, the molecules have lower average speeds.
(b). With fewer molecules per unit volume, the molecules hit the walls of the container less often.
(c). With lower average speeds, on average the molecules hit the walls of the container with less force.
Explanation:
Ideal gas law is given as;
PV = nRT
Where;
P is the pressure of the gas
V is the volume of the gas
n is the number of moles of the gas (amount of gas )
R is ideal gas constant
T is the temperature of the gas
If the amount of gas is decreased, while the volume and temperature are held constant, the pressure will decrease because number of gas moles per unit volume will be reduced, causing the entropy of the gas to be reduced since entropy decreases with decrease in gas molecules.
As the entropy of the gas molecules reduce, the average speed of the gas molecules will be reduced as well, this will cause fewer collision of the gas molecules with the walls of the container ( i.e on average the gas molecules hit the walls of the container with less force since force is directly proportional to speed, and less force implies less pressure since the contact surface is constant).
Choosing all that apply:
- (a). With fewer molecules in the container, the molecules have lower average speeds.
- (b). With fewer molecules per unit volume, the molecules hit the walls of the container less often.
- (c) . With lower average speeds, on average the molecules hit the walls of the container with less force.
Answer:
25.6mL NaOH
Explanation:
We are given the Molarity of the solution () and the volume of the solution (.02L).
By multiplying the two together, we can find the moles of solution that are reacted with HCl.
This gives us .0082 moles of HCl.
We then find the moles of NaOH that are needed to react with the HCl using the equation.
As HCl and NaCl have a 1:1 ratio, we need .0082 mol of NaOH.
Dividing this value by the Molarity of the solution
Gives us the answer, in Liters (.0256), which we can then divide by 100 convert to mL.
Scientific modelling. In science, a model is a representation of an idea, an object or even a process or a system that is used to describe and explain phenomena that cannot be experienced directly. Models are central to what scientists do, both in their research as well as when communicating their explanations.