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Question 7 0.5 pts What mass of lead will absorb the same amount of energy as...
12:47 1 Exit Question 1 0.5 pts When 34.8 g of sodium chloride is dissolved in...
12:47 1 Exit Question 1 0.5 pts When 34.8 g of sodium chloride is dissolved in water, 2.31 kJ of energy is absorbed. Is the enthalpy of dissolution of NaCl exothermic or endothermic? Endothermic Exothermic Question 2 0.5 pts What is the balanced thermochemical equation for the combustion of two moles of gaseous acetylene, C2H2, with oxygen to produce carbon dioxide and water vapor at 24.59°C given that 2512 kJ of heat is released at a constant pressure of 1.14...
Question 4 4 pts A piece of metal with a specific heat of 1.29 J/gºC is...
Question 4 4 pts A piece of metal with a specific heat of 1.29 J/gºC is heated to 126.6°C and then placed in 133.868 g of water which is at a temperature of 10.9 °C. After a minute, the temperature of the water has stopped changing and is now 45.6°C. Assuming that there are no heat losses to the container or surroundings, what is the mass of the piece of metal in grams? Assume that water has a specific heat...
correct sig fig number please! Question 49 (1 point) A student runs the reaction below starting...
correct sig fig number please!
Question 49 (1 point) A student runs the reaction below starting with 53 grams of ammonia (NH3). How many grams of water should form? 4 NH3 + 5 O2 - 4 NO + 6 H20 NH3 molar mass = 17.04 g/mol H20 molar mass = 18.02 g/mol Report your answer with the correct number of significant figures. Your Answer: I Answer units Question 50 (1 point) When 6.23 grams of an unknown metal is heated...
Question 10 0.5 pts What mass of lead sulfate (PbSO4) is formed in a lead-acid storage...
Question 10 0.5 pts What mass of lead sulfate (PbSO4) is formed in a lead-acid storage battery when 1.00 g of Pb undergoes oxidation? Hint: Lead-Acid batter cell: Pb(s) + PbO2(s) + 2 H2SO4(aq) → 2 PbSO4(s) + 2 H2O(1) Hint #2: Convert grams to moles and then moles back into grams. Mass of PbSO4 formed = 0.007 grams Mass of PbSO4 formed = 0.275 grams Mass of PbSO4 formed = 1.225 grams Mass of PbSO4 formed = 2.275 grams...
Please answer quick. Thank you Question 9 1 pts A water sample with unknown mass absorbed...
Please answer quick. Thank you
Question 9 1 pts A water sample with unknown mass absorbed 100.0 J of heat and the temperature increased from 25.0 C to 29.7 C. What is the mass of this water sample? Specific heat of water = 4.184 J/(gC). Note: To avoid any sig fig issues, please keep only two sig figs for your input!!
Question 3 1 pts Gaseous ammonia reacts with oxygen to produce nitrogen and water vapor according...
Question 3 1 pts Gaseous ammonia reacts with oxygen to produce nitrogen and water vapor according to the following thermochemicl equation: 4 NH3(g) + 3029 +2 N2(g) + 6 H20 (g); AH = -1232 kJ How much heat (kJ) is produced when 17.9 g of ammonia are reacted in excess oxygen? (3 sig figs, fill in the number ONLY!) Question 4 0.5 pts Which of the following are intensive properties? Note that there may be more than one correct choice....
Question 10 0.5 pts Consider the heating curve of water below. What is the energy change...
Question 10 0.5 pts Consider the heating curve of water below. What is the energy change (in kJ) when 38.5 g of water vapor (or steam) at 135°C is cooled to 95°C? Hint: Cice = 2.09 J/(g•°C), Cwater = 4.18 J/(g°C), Csteam = 2.00 J//goºC) Hint: A Hus = 6.02 kJ/mol, AHvap = 40.7 kJ/mol 140°C - Temperature 100°C 0°C -100 +93.5 -90.6
Question 1 1 pts Calculate the mass of potassium chloride, KCI, (in grams) formed when 7.00 g of chlorine gas is allowe...
Question 1 1 pts Calculate the mass of potassium chloride, KCI, (in grams) formed when 7.00 g of chlorine gas is allowed to react with 5.00 g of potassium. (write the chemical reaction first) 7.36 7.38 14.7 4.77 9.53 Question 2 1 pts Carbon dioxide is produced in the following reaction: 5 H2C204(aq) + 2 KMnO4 (aq) + 3 H2SO4 (aq) → 10 CO2(g) + 2 MnSO4 (aq) + K2SO4 (aq) + 8 H20 (1) What is the limiting reagent...
Please help with each one 2. (20 pts.) Calculate the specific heat of a piece of...
Please help with each one
2. (20 pts.) Calculate the specific heat of a piece of metal if its mass is 25.52 grams and the metal gives off 1551 Joules of heat when cooled to 20 °C from an initial temperature of 85 °C. c.) 0.440J d.) 0.940 J c.) d.) 0.450 g 0.940 J/g °C . (15 pt.) From your Question #5 result, identify the metal using the following table: Metal ΑΙ Fe Hg Bi Cu Pb Specific Heat...
When 1436 J of heat energy is added to 41.2 g of hexane, CH,,, the temperature...
When 1436 J of heat energy is added to 41.2 g of hexane, CH,,, the temperature increases by 15.4 °C. Calculate the molar heat capacity of CH. Cp = 1/(mol·°C) Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 7.10 MJ of energy in the form of heat if the temperature of the sodium is not to increase by more than 10.0 "C? Use Cp = 30.8 J/(K.mol) for...
12:47 1 Exit Question 1 0.5 pts When 34.8 g of sodium chloride is dissolved in water, 2.31 kJ of energy is absorbed. Is the enthalpy of dissolution of NaCl exothermic or endothermic? Endothermic Exothermic Question 2 0.5 pts What is the balanced thermochemical equation for the combustion of two moles of gaseous acetylene, C2H2, with oxygen to produce carbon dioxide and water vapor at 24.59°C given that 2512 kJ of heat is released at a constant pressure of 1.14...
Question 4 4 pts A piece of metal with a specific heat of 1.29 J/gºC is heated to 126.6°C and then placed in 133.868 g of water which is at a temperature of 10.9 °C. After a minute, the temperature of the water has stopped changing and is now 45.6°C. Assuming that there are no heat losses to the container or surroundings, what is the mass of the piece of metal in grams? Assume that water has a specific heat...
correct sig fig number please!
Question 49 (1 point) A student runs the reaction below starting with 53 grams of ammonia (NH3). How many grams of water should form? 4 NH3 + 5 O2 - 4 NO + 6 H20 NH3 molar mass = 17.04 g/mol H20 molar mass = 18.02 g/mol Report your answer with the correct number of significant figures. Your Answer: I Answer units Question 50 (1 point) When 6.23 grams of an unknown metal is heated...
Question 10 0.5 pts What mass of lead sulfate (PbSO4) is formed in a lead-acid storage battery when 1.00 g of Pb undergoes oxidation? Hint: Lead-Acid batter cell: Pb(s) + PbO2(s) + 2 H2SO4(aq) → 2 PbSO4(s) + 2 H2O(1) Hint #2: Convert grams to moles and then moles back into grams. Mass of PbSO4 formed = 0.007 grams Mass of PbSO4 formed = 0.275 grams Mass of PbSO4 formed = 1.225 grams Mass of PbSO4 formed = 2.275 grams...
Please answer quick. Thank you
Question 9 1 pts A water sample with unknown mass absorbed 100.0 J of heat and the temperature increased from 25.0 C to 29.7 C. What is the mass of this water sample? Specific heat of water = 4.184 J/(gC). Note: To avoid any sig fig issues, please keep only two sig figs for your input!!
Question 3 1 pts Gaseous ammonia reacts with oxygen to produce nitrogen and water vapor according to the following thermochemicl equation: 4 NH3(g) + 3029 +2 N2(g) + 6 H20 (g); AH = -1232 kJ How much heat (kJ) is produced when 17.9 g of ammonia are reacted in excess oxygen? (3 sig figs, fill in the number ONLY!) Question 4 0.5 pts Which of the following are intensive properties? Note that there may be more than one correct choice....
Question 10 0.5 pts Consider the heating curve of water below. What is the energy change (in kJ) when 38.5 g of water vapor (or steam) at 135°C is cooled to 95°C? Hint: Cice = 2.09 J/(g•°C), Cwater = 4.18 J/(g°C), Csteam = 2.00 J//goºC) Hint: A Hus = 6.02 kJ/mol, AHvap = 40.7 kJ/mol 140°C - Temperature 100°C 0°C -100 +93.5 -90.6
Question 1 1 pts Calculate the mass of potassium chloride, KCI, (in grams) formed when 7.00 g of chlorine gas is allowed to react with 5.00 g of potassium. (write the chemical reaction first) 7.36 7.38 14.7 4.77 9.53 Question 2 1 pts Carbon dioxide is produced in the following reaction: 5 H2C204(aq) + 2 KMnO4 (aq) + 3 H2SO4 (aq) → 10 CO2(g) + 2 MnSO4 (aq) + K2SO4 (aq) + 8 H20 (1) What is the limiting reagent...
Please help with each one
2. (20 pts.) Calculate the specific heat of a piece of metal if its mass is 25.52 grams and the metal gives off 1551 Joules of heat when cooled to 20 °C from an initial temperature of 85 °C. c.) 0.440J d.) 0.940 J c.) d.) 0.450 g 0.940 J/g °C . (15 pt.) From your Question #5 result, identify the metal using the following table: Metal ΑΙ Fe Hg Bi Cu Pb Specific Heat...
When 1436 J of heat energy is added to 41.2 g of hexane, CH,,, the temperature increases by 15.4 °C. Calculate the molar heat capacity of CH. Cp = 1/(mol·°C) Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 7.10 MJ of energy in the form of heat if the temperature of the sodium is not to increase by more than 10.0 "C? Use Cp = 30.8 J/(K.mol) for...
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