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Question 3 0.5 out of 0.5 points _reaction absorbs energy and may be accompanied by a decrease in temperature. 0.5 out of 0.5 points Question 4 What volume does 13.6 g of O2 gas at 37°C and 135 kPa occupy? PV=nRT 0.5 out of 0.5 points Question 5 in PV = nRT. What does Rstand for Question 6 0.5 out of 0.5 points In the equation 2Mg + 02 -> 2Mgo, which are the reactants? + 0.5 out of 0.5 points Question 7 Is calcium oxidized or reduced in the following reaction? 2ca0-> 202 +02
Question 8 0.5 out of 0.5 point Which of the following is the balanced half-reaction for the oxidation of Cu to cu+2? 0.5 out of 0.5 point Question 9 Based on the activity series, which metal could X represent in the reaction below? * + Ca(NO3)2 --> Ca + X(NO3)2 Symbol Name Lithium Barium u Ba Strontium SI Decreasing reactivity Ca Calcium Magnesium Zinc Mg Zn Iron Fe
Question 10 Needs Grading What volume of water is required to dilute 120 cm3 of 10 mol dm-3 sulphuric acid to a concentration of 2 mol dm-3 show your work Question 11 Needs Grading A lab group completes three runs of a standardization of NaOH. The calculated molarity of each run is 1.002 M. 1.012 M, 1.008 M. What is the percent deviation of the second run? show your work Needs Grading Question 12 Applying Hess's law, calculate the enthalpy change (AH) for Reaction 2. Show your work Reaction 1,00 MW)/0,() AH +385 Find the SH for the following reaction 2: Reaction 2 : 2H (8) +0,6) 2H, AH__
Needs Grading Question 13 What volume will 12.0 g of oxygen gas (O2) occupy at 25°C and a pressure of 52.7 kPa show your work Question 14 Needs Grading At a pressure of 185 mmHg and a temperature of 55-C, what volume would 2.55*1028 molecules of nitrogen gas occupy? Needs Grading Question 15 The initial and final burette reading is shown below: Initial burette reading Final burette reading A student performed an experiment on standardization of Nach with KHP (Molar mass of KHP204.2 g/mol). NaOH is added in the burette and KHP is added in the Erlenmeyer flask. Answer the following questions and show your work for calculations
The initial and final burette reading is shown below: Initial burette reading Final burette reading A student performed an experiment on standardization of NaOH with KHP (Molar mass of KHP= 204.2 g/mol). NaOH is added in the burette and KHP is added in the Erlenmeyer flask. Answer the following questions and show your work for calculations: a. From the burette readings, Calculate the volume of NaOH in ml. Convert this volume into litres. b. If a student weighs 0.575 g KHP, calculate the number of moles of KHP. c. Calculate the molarity of NaOH.