share some tough questions of mole concept and molecular mass... class 9th
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1
(1.) What mass of methanol (CH3OH) must be added to 2.5 mole of ethanol (C2H5OH) in order to produce a solution containing equal numbers of molecules of the two species?
(2.) Assuming no chemical reaction occurs, what is the total number of molecules present in the resulting solution?
2
The diatomic molecule of an element Z has a mass of 6.31 x 10-23g. What is the atomic weight of the element Z?
3
Hydrogen chloride gas (7.3 g) is in a container at a pressure of 2.5 atmosphere and a temperature of 300 K.
(1.) How many moles of gas are present?
(2.) How many molecules of gas are present?
(3.) If all the gas were dissolved in 100 cm3 of water, what mass of silver nitrate would need to be added to precipitate all the chloride ion produced.
4
What is the mass in g of each of the following at 273 K and 101 kPa?
(1.) neon (22.4 litre).
(2.) ice (22.4 litre).
(3.) mercury (0.10 mol).
5
Formic acid (HCOOH) is a liquid monoprotic acid.
(1.) What amount (in mole) of formic acid is present in 1.00 litre of the pure substance at 298 K?
(2.) What mass of formic acid should be taken and diluted to obtain 1.00 litre of a 0.075 M solution?
I think these are sufficient for you
(1.) What mass of methanol (CH3OH) must be added to 2.5 mole of ethanol (C2H5OH) in order to produce a solution containing equal numbers of molecules of the two species?
(2.) Assuming no chemical reaction occurs, what is the total number of molecules present in the resulting solution?
2
The diatomic molecule of an element Z has a mass of 6.31 x 10-23g. What is the atomic weight of the element Z?
3
Hydrogen chloride gas (7.3 g) is in a container at a pressure of 2.5 atmosphere and a temperature of 300 K.
(1.) How many moles of gas are present?
(2.) How many molecules of gas are present?
(3.) If all the gas were dissolved in 100 cm3 of water, what mass of silver nitrate would need to be added to precipitate all the chloride ion produced.
4
What is the mass in g of each of the following at 273 K and 101 kPa?
(1.) neon (22.4 litre).
(2.) ice (22.4 litre).
(3.) mercury (0.10 mol).
5
Formic acid (HCOOH) is a liquid monoprotic acid.
(1.) What amount (in mole) of formic acid is present in 1.00 litre of the pure substance at 298 K?
(2.) What mass of formic acid should be taken and diluted to obtain 1.00 litre of a 0.075 M solution?
I think these are sufficient for you
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