A student weighs out 0.975 g of magnesium oxide (MgO, MM = 40.31 g/mol) and adds it to a constant pressure calorimeter containing 100.0 mL of 0.600 M HCl at 22.1°C. After the reaction stopped, the temperature of the solution inside the calorimeter was 25.2°C. Calculate the ∆H (in kJ) for the reaction. Assume the specific heat of the solution is 4.18 J/g°C and the density of the solution is 1.00 g/ml. MgO (s) + HCl (aq) → MgCl2 (aq) + H2O (l)
Is this reaction endothermic or exothermic?
A student weighs out 0.975 g of magnesium oxide (MgO, MM = 40.31 g/mol) and adds...
If 1.85 g MgO is combined with enough 1.00 M HCl to make 100.0 mL of solution in a coffee-cup calorimeter, the temperature of the resulting solution increases from 21.3°C to 35.7 °C. Calculate the enthalpy change for the reaction per mole of Mgo. Assume that the specific heat capacity of the solution is 4.18 J/g.K, and the density of the solution is 1.00 g/mL. A 0.704 g of a pure acid, HA, is dissolved in water and an acid-base...
Magnesium Ribbon Record all masses to the 0.01 g, except for the mass of Mg and the mass of MgO used. These should be recorded to the 0.0001 g. Table 7 Mass (g) 40 28.54 Calorimeter Calorimeter & Water & Acid 4.9 103.66 Water & Acid 4075.12 Magnesium Ribbon 490.1212 Enter the following temperatures to the nearest 0.1°C. Table 8 Temperature (°C) Calorimeter & Acidic Water 49 19.5 Maximum Temperature Reached 49 25.2 V Magnesium Oxide Table 9 Mass (g)...
Magnesium (Mg) reacts with oxygen gas (O2) to produce magnesium oxide (MgO). 2Mg + O2 → 2MgO How many grams of MgO are produced when 40.0 grams of O2 react completely with Mg? [Note Mg = 24.31 g/mol, O2 = 32.00 g/mol, MgO = 40.31 g/mol] 30.4 g 50.4 g 60.8 g 101 g 201 g What is the molarity of a solution containing 41.7 g of NaOH in 325 mL of NaOH solution? [Note: 1 mole NaOH = 40.00 g]...
Suppose you place 0.0600 g of magnesium chips in a coffee-cup calorimeter and then add 100.0 mL of 1.00 M HCl. The reaction that occurs is Mg(s) + 2 HCl(aq) → H2(g) + MgCl2(aq) The temperature of the solution increases from 23.11 °C (296.26 K) to 25.81 °C (298.96 K). What is the enthalpy change for the reaction per mole of Mg? Assume a specific heat capacity of the solution is 4.20 J/g∙K and the density of the HCl solution...
If 1.85 g MgO is combined with enough 1.00 M HCl to make 100.0 mL of solution in a coffee- cup calorimeter, the temperature of the resulting solution increases from 21.3°C to 35.7 °C. Calculate the enthalpy change for the reaction per mole of Mgo. Assume that the specific heat capacity of the solution is 4.18 J/g.K, and the density of the solution is 1.00 g/mL. - 131 kJ O -613 kJ O-328 kJ 0 -28.3 kJ
BG35.2 Enthalpy of Formation of Mgo Page 9 of 12 PRELAB QUESTIONS 1. Read the writeup through the Data Analysis section. A student carried out the experiment described there. The student used 0.4894 g of Mg in the first reaction and found that the temperature of the solution went from 22.1 to 42.7'C. In the second reaction, 0.803 g of MgO was used and the solution went from 22.7 to 28.7°C. Calculate the following (show the calculations beside and/or below...
A student masses 5.34 g of NH4Cl, and adds it to a calorimeter containing 100.0 mL of water at 21.0 oC. As the salt dissolves, the temperature drops to 17.6 oC. Calculate the ΔHsol of ammonium chloride in kJ/mol. Is the process endothermic or exothermic? Explain. Density of water 1.00g/mL. Specific heat of water = 4.184 J/g oC
1.00 M HCL t2 = 60.06 °C t1 = 21.62 °C Mass Mg = .500 g For reaction 1: MgO(s) + 2 HCl(aq) ----> MgCl2(aq) + H20(1). 1.6 Enter q (in kJ). 1.74 kJ Computer's answer now shown above. You are correct. Previous Tries Your receipt no. is 158-3788 ? 1.7 Enter AH (in kJ). -1.74 kJ Computer's answer now shown above. You are correct. Previous Tries Your receipt no. is 158-1858 ? 1.8 Enter the number of moles of...
Specific heat = 4.18 J/g*C MgO(s) + 2HCl(aq) → 2Cl(aq) + Mg(aq) + H2O(l): AH = A student added 0.250 g of MgO(s) to 45.0 mL HCI@ 22.0'C. The temp of the calorimeter rose to 23.5°C. What is qarin kJ? What is the AH in kJ/mol of Mgo for this reaction? Density HCI = 1.05 g/mL
Consider the following reaction: Mg (s) + 2 HCl (aq) → MgCl2 (aq) + H2 (g) ΔHrxn = –4.6 × 102 kJ a. Is this reaction endothermic or exothermic? Circle one. [1] b. How much heat is evolved when 1.37 g of Mg are dissolved in excess HCl? [5] c. If 1.37 g of Mg are dissolved in enough HCl to make 250.0 mL of solution in a coffee-cup calorimeter, what is the final temperature of the solution? (Assume density...