An enclosed gas(i.e. one in a sealed container) has a volume of
and a temperature of
. The pressure of the gas is
. Calculate the number of moles of gas that are present in the container.
What pressure will
of gaseous nitrogen exert if it is pumped into a container that has a volume of
at a temperature of
?
The volume of air inside a tyre is 19 litres and the temperature is
. You check the pressure of your tyres and find that the pressure is
. How many moles of air are present in the tyre?
Compressed carbon dioxide is contained within a gas cylinder at a pressure of 700 kPa. The temperature of the gas in the cylinder is
and the number of moles of gas is
of carbon dioxide. What is the volume of the gas inside the cylinder?
Molar concentrations of liquids
A typical solution is made by dissolving some solid substance in a liquid. The amount of substance that is dissolved in a given volume of liquid is known as the
concentration of the liquid. Mathematically, concentration (C) is defined as moles of solute (n) per unit volume (V) of solution.
For this equation, the units for volume are
. Therefore, the unit of concentration is
.
When concentration is expressed in
it is known as the
molarity (M) of the solution. Molarity is the most common expression for concentration.
Do not confuse molarity (M) with molar mass (M). Look carefully at the question in which the M appears to determine whether it is concentration or molar mass.
Concentration
Concentration is a measure of the amount of solute that is dissolved in a given volume of liquid. It is measured in
. Another term that is used for concentration is
molarity (M)
If
of sodium hydroxide (NaOH) is dissolved in
of water, what is the concentration of the solution in
?
The concentration of the solution is
or
You have a
container in which to prepare a solution of potassium permanganate (
). What mass of
is needed to make a solution with a concentration of
?
therefore
The mass of
that is needed is
.
How much sodium chloride (in g) will one need to prepare
of solution with a concentration of
?
The mass of sodium chloride needed is
Molarity and the concentration of solutions
of potassium bromide was dissolved in
of water. Calculate its molarity.
of sodium chloride (NaCl) is dissolved in
of water.
How many moles of NaCl are present in solution?
What is the volume of water (in
)?
Calculate the concentration of the solution.
What mass of sodium chloride would need to be added for the concentration to become
?
What is the molarity of the solution formed by dissolving
of sodium hydroxide (
) in
of water?
What mass (g) of hydrogen chloride (
) is needed to make up
of a solution of concentration
?
How many moles of
are there in
of a
sulphuric acid solution? What mass of acid is in this solution?
Questions & Answers
I'm interested in biological psychology and cognitive psychology
Communication is effective because it allows individuals to share ideas, thoughts, and information with others.
effective communication can lead to improved outcomes in various settings, including personal relationships, business environments, and educational settings. By communicating effectively, individuals can negotiate effectively, solve problems collaboratively, and work towards common goals.
it starts up serve and return practice/assessments.it helps find voice talking therapy also assessments through relaxed conversation.
miss
Every time someone flushes a toilet in the apartment building, the person begins to jumb back automatically after hearing the flush, before the water temperature changes. Identify the types of learning, if it is classical conditioning identify the NS, UCS, CS and CR. If it is operant conditioning, identify the type of consequence positive reinforcement, negative reinforcement or punishment
nature is an hereditary factor while nurture is an environmental factor which constitute an individual personality. so if an individual's parent has a deviant behavior and was also brought up in an deviant environment, observation of the behavior and the inborn trait we make the individual deviant.
Samuel
I am taking this course because I am hoping that I could somehow learn more about my chosen field of interest and due to the fact that being a PsyD really ignites my passion as an individual the more I hope to learn about developing and literally explore the complexity of my critical thinking skills
