Question

1. Convert the following masses into number of moles a. 128.96 g of Cu b. 87.2 g of Hg. 2. The molecular formula of acetylsalicylic acid (aspirin), one of the most common pain relievers, is HC9H7O4. a. How many moles of HC9H7O4 are in a 0.500-g tablet of aspirin? b. How many molecules of Hc9H7O4 are in this tablet? 3. Calculate the percentage by mass of the indicated element in the following compounds: a. Carbon in acetylene, C2H2, a gas used in welding. b. Oxygen in ascorbic acid, HC6H7O6, also known as vitamin C 4. The fizz produced when an Alka-Seltzer® tablet is dissolved in water is due to the reaction between sodium bicarbonate (NaHCO3) and citric acid (H3C6H5O7): 3NaHCO3(aq) + H3C6H5O7 (aq) ? 3CO2(g) + 3H2O(l) + Na3C6H5O7(aq) In a certain experiment 1.00 g of sodium bicarbonate and 1.00 g of citric are allowed to react. a. Which is the limiting reactant? b. How many grams of carbon dioxide form? c. How many grams of the excess reactant remain after the limiting reactant is completely consumed? 5. What is the molarity of potassium hydroxide solution if 38.65 ml of the KOH solution is required to titrate 25.84 ml of 0.1982 M of hydrochloric acid solution? 6. In an experiment, a student titrated 0.1060 g of sodium carbonate (Na2CO3) dissolved in water with a standard 0.09115 mol dm-3 hydrochloric acid (HCl) solution from a burette. a. Write a balanced chemical equation for the titration reaction. b. What volume of the HCl solution is required to reach the end point? 7. 35 mL of 18.0 M H2SO4 solution was dissolved in enough water to make 250 mL of solution. What is the molarity of the dilute solution?

Name: 1 convert the following masses into number of moles a 12896 g of cu b 872 g of hg 2 the molecular formula of acetylsalicylic acid aspirin one of the most common pain relievers is hc9h7o4 a how many mo
Uploaded: 2021-09-14T09:59:49-08:00
Duration: 2 min 38 s
Channel: Jincy M Saji
Description: 1 convert the following masses into number of moles a 12896 g of cu b 872 g of hg 2 the molecular formula of acetylsalicylic acid aspirin one of the most common pain relievers is hc9h7o4 a how many mo

          1. Convert the following masses into number of moles
a. 128.96 g of Cu
b. 87.2 g of Hg.
2. The molecular formula of acetylsalicylic acid (aspirin), one of the most common pain
relievers, is HC9H7O4.
a. How many moles of HC9H7O4 are in a 0.500-g tablet of aspirin?
b. How many molecules of Hc9H7O4 are in this tablet?
3. Calculate the percentage by mass of the indicated element in the following compounds:
a. Carbon in acetylene, C2H2, a gas used in welding.
b. Oxygen in ascorbic acid, HC6H7O6, also known as vitamin C 
4. The fizz produced when an Alka-Seltzer® tablet is dissolved in water is due to the reaction
between sodium bicarbonate (NaHCO3) and citric acid (H3C6H5O7):
3NaHCO3(aq) + H3C6H5O7 (aq) ? 3CO2(g) + 3H2O(l) + Na3C6H5O7(aq)
In a certain experiment 1.00 g of sodium bicarbonate and 1.00 g of citric are allowed to react.
a. Which is the limiting reactant?
b. How many grams of carbon dioxide form?
c. How many grams of the excess reactant remain after the limiting reactant is
completely consumed?
5. What is the molarity of potassium hydroxide solution if 38.65 ml of the KOH solution is
required to titrate 25.84 ml of 0.1982 M of hydrochloric acid solution?
6. In an experiment, a student titrated 0.1060 g of sodium carbonate (Na2CO3) dissolved in
water with a standard 0.09115 mol dm-3 hydrochloric acid (HCl) solution from a burette.
a. Write a balanced chemical equation for the titration reaction.
b. What volume of the HCl solution is required to reach the end point?
7. 35 mL of 18.0 M H2SO4 solution was dissolved in enough water to make 250 mL of solution.
What is the molarity of the dilute solution?

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