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How many milliliters of a 0.625 M KOH solution would contain 0.0250 mole of KOH?
A weather balloon contains 8.80 moles of helium at a pressure of 0.992 atm and a temperature of 25°C at ground level. What is the volume of the balloon under these conditions?
What is the temperature of an 11.2 L sample of carbon monoxide, CO, at 744 torr if it occupies 13.3 L at 55°C and 744 torr?
An organic compound was found to contain 54.5 % C, 9.2 % H, and 36.3 % O.
a. What is the empirical formula of the compound?
b. If the molar mass of the compound is 88.1 g/mol, what is its molecular formula?
Identify the functional group(s) that appear in propranolol. This chemical belongs to the family of medicines known as beta-blockers are drugs that are used to reduce blood pressure. Choose 3 among the list of functional groups:
NH OH O Propranolol
write structure of c4h10o
A Laboratory assistant prepares 5 litres of 0.1N hydrochloric acid stock solution
using commercial HCl available in laboratory which has percentage purity of 35%
(w/w) and specific gravity of 1.18 g/ml. Then he fills five 100ml standard flasks with
50.0ml of 0.1N HCl solution and dilutes it with distilled water upto the mark. Then he
takes 10ml of diluted HCl solution from each flask into a conical flask, mixes it and
adds 50ml of 0.025M Sodium hydroxide solution to it. Finally, he adds few drops of
phenolphthalein to the resulting solution in the conical flask.
i) What was the concentration of HCl solution prepared in 100ml standard
flasks?
ii) What do you think will be the colour of the resulting solution after addition of
indicator?
iii) Calculate the pH of the resulting solution.
Calculate the concentration of ascorbic acid, in percentage per mass, in a solution prepared by dissolving 22 g of ascorbic acid with 75 g of water.
Calculate the concentration of ascorbic acid, in percentage per mass, in a solution prepared by dissolving 22 g of ascorbic acid with 75 g of water.
1. Solid phosphorous reacts with chlorine gas to produce phosphorous chloride liquid.
How many grams of chlorine gas is required when 1.45 g of phosphorous was used?
2. What volume of hydrogen gas at STP is produced as sulfuric acid acts on 24 g of
calcium?
3.What weight of magnesium is needed to react with HCl to produce 67.2L of hydrogen
gas at STP?
4.What volume of oxygen gas is required to burn 50 L of acetylene gas C2H2 at STP?
