Chemistry Stp
PROBLEM SOLVING.
1. Calculate how many hydrogen atoms are contained in 2.3g of C2H5OH. [2]
2.3 x 1023 Hydrogen Atoms - 2.3g * 1mol/6.06g * 6.02 1023 / 1mol
2. An oxide of sulfur contains 60% by mass of oxygen. Determine the empirical formula of the compound. [2]
3. Ethylene glycol, the substance used in automobile antifreeze, is composed of 38.7 g carbon, 9.7 g hydrogen, and 51.6 g oxygen.
a. What is the empirical formula of the compound? [2]
b. If its molar mass is 62.1 g/mol, what is the molecular formula of ethylene glycol? [1]
4. The temp in kelvin of 4.0 L of hydrogen is increased by a factor of 3 and the pressure is increased by a factor of 4. Calculate the final volume of the gas. [2]
5. How many liters of product at 950 mmHg and O°C is produced by the burning of three liters of acetylene (C2H2) at 5 atm and 20°C? [2]
6. What is the mass of 15 liters of chlorine gas at STP? [2]
7. Write the balanced equation for each
a. Nitrogen and oxygen react in cylinders of car engines to form nitrogen monoxide. [1]
b. Nitrogen monoxide is a primary pollutant. After it escapes into the atmosphere, it reacts with oxygen to produce nitrogen dioxide. [1]
c. Nitrogen dioxide is a secondary pollutant which can react further with oxygen and water in the atmosphere to produce nitric acid, one of the component of acid rain. [1]
8. The fizz produced when Alka-Seltzer tablet is dissolved in water is due to the reaction of sodium bicarbonate (NaHCO3) and citric acid (H3C6H5O7) 3NaHCO3(aq) + H3C6H5O7(aq) --> 3CO2 + 3H2O + Na3C6H5O7(aq)
In a certain experiment, 5.00 g of sodium bicarbonate and 5.00 g of citric acid are allowed to react.
a. Which is the limiting reactant? Show solutions to prove your answer. [3]
b. How many grams of carbon dioxide are formed? [2]
1. Calculate how many hydrogen atoms are contained in 2.3g of C2H5OH. [2]
2.3 x 1023 Hydrogen Atoms - 2.3g * 1mol/6.06g * 6.02 1023 / 1mol
2. An oxide of sulfur contains 60% by mass of oxygen. Determine the empirical formula of the compound. [2]
3. Ethylene glycol, the substance used in automobile antifreeze, is composed of 38.7 g carbon, 9.7 g hydrogen, and 51.6 g oxygen.
a. What is the empirical formula of the compound? [2]
b. If its molar mass is 62.1 g/mol, what is the molecular formula of ethylene glycol? [1]
4. The temp in kelvin of 4.0 L of hydrogen is increased by a factor of 3 and the pressure is increased by a factor of 4. Calculate the final volume of the gas. [2]
5. How many liters of product at 950 mmHg and O°C is produced by the burning of three liters of acetylene (C2H2) at 5 atm and 20°C? [2]
6. What is the mass of 15 liters of chlorine gas at STP? [2]
7. Write the balanced equation for each
a. Nitrogen and oxygen react in cylinders of car engines to form nitrogen monoxide. [1]
b. Nitrogen monoxide is a primary pollutant. After it escapes into the atmosphere, it reacts with oxygen to produce nitrogen dioxide. [1]
c. Nitrogen dioxide is a secondary pollutant which can react further with oxygen and water in the atmosphere to produce nitric acid, one of the component of acid rain. [1]
8. The fizz produced when Alka-Seltzer tablet is dissolved in water is due to the reaction of sodium bicarbonate (NaHCO3) and citric acid (H3C6H5O7) 3NaHCO3(aq) + H3C6H5O7(aq) --> 3CO2 + 3H2O + Na3C6H5O7(aq)
In a certain experiment, 5.00 g of sodium bicarbonate and 5.00 g of citric acid are allowed to react.
a. Which is the limiting reactant? Show solutions to prove your answer. [3]
b. How many grams of carbon dioxide are formed? [2]