Avogadro’s number has a value of × 10 and is the number of atoms/molecules/formu

Question

Avogadro’s number has a value of × 10 and is the number of atoms/molecules/formula units in 1 of a substance.


Flag this Question Question 2 6.25 pts To the nearest tenth of a gram, what is the mass of 7 moles of silver?


Flag this Question Question 3 6.25 pts To the nearest tenth of a mole, how many moles of nitrogen gas has a mass of 224 g?


Flag this Question Question 4 6.25 pts Lead permanganate has the chemical formula Pb(MnO4)2. To the nearest hundredth of an atomic mass unit, what is the formula mass of lead permanganate?


Flag this Question Question 5 6.25 pts Given your result in the previous question, how many moles are present in 507 g of lead permanganate? Round to the nearest hundredth of a mole.


Flag this Question Question 6 6.25 pts To carry out a chemical reaction, you need 0.61 mol of HCl. If you have a 5.0 M solution of HCl, how many liters would need to be added to provide the necessary number of moles? Round your answer to the nearest hundredth of a liter.


Flag this Question Question 7 6.25 pts Copper(II) chloride has the chemical formula CuCl2. We wish to make a solution of copper(II) chloride by adding it to a volumetric flask, then filling the flask with water. If 234 g of copper(II) chloride is added to the volumetric flask and water is added to produce a 1.0 L solution, what is the molarity of the solution? Give your answer to the nearest hundredth molar (that is, mol/L).


Oxygen gas (O2) is required to burn propane (C3H8), producing carbon dioxide (CO2) and water (H2O) in the process. This is represented by the chemical equation 5O2 + C3H8 3CO2 + 4H2O How many grams of oxygen gas are required to burn 300 g of propane? Round to the nearest gram.


Flag this Question Question 10 6.25 pts Exothermic reactions give off energy; Endothermic reactions take in energy.


Flag this Question Question 11 6.25 pts Chunks of solid sodium bicarbonate react with acetic acid in solution, producing water, carbon dioxide, and sodium acetate in the process. How could this reaction be sped up? Select all that would apply!
cool off the acetic acid solution
substitute a higher molarity acetic acid solution
stir the reactants together
grind the chunks of sodium bicarbonate into powder first
dilute the acetic acid solution by adding water
warm up the acetic acid solution

Flag this Question Question 12 25 pts Sulfur dioxide and oxygen gas react to produce sulfur trioxide in an exothermic reaction 2SO2 + O2 2SO3 At the same time, the endothermic reverse reaction occurs, breaking the sulfur trioxide apart 2SO3 2SO2 + O2 Therefore, a chemical equilibrium is reached between the three gases: 2SO2 + O2 2SO3 This reaction is allowed to take place within a sealed container. If we want to produce more sulfur trioxide, we could - [ Select ] ["increase", "decrease"] the temperature in the container - [ Select ] ["decrease", "increase"] the pressure in the container - [ Select ] ["decrease", "increase"] the concentration of oxygen gas in the container - remove [ Select ] ["sulfur trioxide", "sulfur dioxide"] from the container
Avogadro’s number has a value of × 10 and is the number of atoms/molecules/formula units in 1 of a substance.


Flag this Question Question 2 6.25 pts To the nearest tenth of a gram, what is the mass of 7 moles of silver?


Flag this Question Question 3 6.25 pts To the nearest tenth of a mole, how many moles of nitrogen gas has a mass of 224 g?


Flag this Question Question 4 6.25 pts Lead permanganate has the chemical formula Pb(MnO4)2. To the nearest hundredth of an atomic mass unit, what is the formula mass of lead permanganate?


Flag this Question Question 5 6.25 pts Given your result in the previous question, how many moles are present in 507 g of lead permanganate? Round to the nearest hundredth of a mole.


Flag this Question Question 6 6.25 pts To carry out a chemical reaction, you need 0.61 mol of HCl. If you have a 5.0 M solution of HCl, how many liters would need to be added to provide the necessary number of moles? Round your answer to the nearest hundredth of a liter.


Flag this Question Question 7 6.25 pts Copper(II) chloride has the chemical formula CuCl2. We wish to make a solution of copper(II) chloride by adding it to a volumetric flask, then filling the flask with water. If 234 g of copper(II) chloride is added to the volumetric flask and water is added to produce a 1.0 L solution, what is the molarity of the solution? Give your answer to the nearest hundredth molar (that is, mol/L).


Oxygen gas (O2) is required to burn propane (C3H8), producing carbon dioxide (CO2) and water (H2O) in the process. This is represented by the chemical equation 5O2 + C3H8 3CO2 + 4H2O How many grams of oxygen gas are required to burn 300 g of propane? Round to the nearest gram.


Flag this Question Question 10 6.25 pts Exothermic reactions give off energy; Endothermic reactions take in energy.


Flag this Question Question 11 6.25 pts Chunks of solid sodium bicarbonate react with acetic acid in solution, producing water, carbon dioxide, and sodium acetate in the process. How could this reaction be sped up? Select all that would apply!
cool off the acetic acid solution
substitute a higher molarity acetic acid solution
stir the reactants together
grind the chunks of sodium bicarbonate into powder first
dilute the acetic acid solution by adding water
warm up the acetic acid solution

Flag this Question Question 12 25 pts Sulfur dioxide and oxygen gas react to produce sulfur trioxide in an exothermic reaction 2SO2 + O2 2SO3 At the same time, the endothermic reverse reaction occurs, breaking the sulfur trioxide apart 2SO3 2SO2 + O2 Therefore, a chemical equilibrium is reached between the three gases: 2SO2 + O2 2SO3 This reaction is allowed to take place within a sealed container. If we want to produce more sulfur trioxide, we could - [ Select ] ["increase", "decrease"] the temperature in the container - [ Select ] ["decrease", "increase"] the pressure in the container - [ Select ] ["decrease", "increase"] the concentration of oxygen gas in the container - remove [ Select ] ["sulfur trioxide", "sulfur dioxide"] from the container
Avogadro’s number has a value of × 10 and is the number of atoms/molecules/formula units in 1 of a substance.


Flag this Question Question 2 6.25 pts To the nearest tenth of a gram, what is the mass of 7 moles of silver?


Flag this Question Question 3 6.25 pts To the nearest tenth of a mole, how many moles of nitrogen gas has a mass of 224 g?


Flag this Question Question 4 6.25 pts Lead permanganate has the chemical formula Pb(MnO4)2. To the nearest hundredth of an atomic mass unit, what is the formula mass of lead permanganate?


Flag this Question Question 5 6.25 pts Given your result in the previous question, how many moles are present in 507 g of lead permanganate? Round to the nearest hundredth of a mole.


Flag this Question Question 6 6.25 pts To carry out a chemical reaction, you need 0.61 mol of HCl. If you have a 5.0 M solution of HCl, how many liters would need to be added to provide the necessary number of moles? Round your answer to the nearest hundredth of a liter.


Flag this Question Question 7 6.25 pts Copper(II) chloride has the chemical formula CuCl2. We wish to make a solution of copper(II) chloride by adding it to a volumetric flask, then filling the flask with water. If 234 g of copper(II) chloride is added to the volumetric flask and water is added to produce a 1.0 L solution, what is the molarity of the solution? Give your answer to the nearest hundredth molar (that is, mol/L).


Oxygen gas (O2) is required to burn propane (C3H8), producing carbon dioxide (CO2) and water (H2O) in the process. This is represented by the chemical equation 5O2 + C3H8 3CO2 + 4H2O How many grams of oxygen gas are required to burn 300 g of propane? Round to the nearest gram.


Flag this Question Question 10 6.25 pts Exothermic reactions give off energy; Endothermic reactions take in energy.


Flag this Question Question 11 6.25 pts Chunks of solid sodium bicarbonate react with acetic acid in solution, producing water, carbon dioxide, and sodium acetate in the process. How could this reaction be sped up? Select all that would apply!
cool off the acetic acid solution
substitute a higher molarity acetic acid solution
stir the reactants together
grind the chunks of sodium bicarbonate into powder first
dilute the acetic acid solution by adding water
warm up the acetic acid solution

Flag this Question Question 12 25 pts Sulfur dioxide and oxygen gas react to produce sulfur trioxide in an exothermic reaction 2SO2 + O2 2SO3 At the same time, the endothermic reverse reaction occurs, breaking the sulfur trioxide apart 2SO3 2SO2 + O2 Therefore, a chemical equilibrium is reached between the three gases: 2SO2 + O2 2SO3 This reaction is allowed to take place within a sealed container. If we want to produce more sulfur trioxide, we could - [ Select ] ["increase", "decrease"] the temperature in the container - [ Select ] ["decrease", "increase"] the pressure in the container - [ Select ] ["decrease", "increase"] the concentration of oxygen gas in the container - remove [ Select ] ["sulfur trioxide", "sulfur dioxide"] from the container

Explanation / Answer

Avogadro’s number has a value of 6.02 × 10^23 and is the number of atoms/molecules/formula units in 1 of a substance.

2) Molar mass of Ag = 107.8682 g/mol

Mass of 7 moles of silver = 7 moles * 107.8682 g/mol

                                     =755.0774 grams

                                    = 755.1 grams (rounded to the nearest tenth of a gram)

                                   

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