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
A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
