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Problem 1 - Energy, q, w, Enthalpy, and Stoichiometry Consider the following reaction: 2Mg(s)+O2(g)>>2MgO(s)?H = -1204kJ 1) Is this reaction exothermic or endothermic? 2) Calculate the amount of heat transferred when 2.5 g of Mg(s) reacts at constant pressure. Express your answer using two significant figures. 3)How many grams of MgO are produced during an enthalpy change of -97.0 kJ ? 4)How many kilojoules of heat are absorbed when 7.90 g of MgO(s) is decomposed into Mg(s) and O2(g) at constant pressure?
The compound lead acetate is a strong electrolyte. Write the reaction when lead acetate is put into water: Make sure to include positive or negative and whether or not each one is (s) (l) or (aq)
What is the final temperature of the nickel and water? The specific heat is 4.18 J/g * C for water and is 0.444 J/g * C for nickel.
After the reaction comes to equilibrium, an additional 1.00g of O2(g) is added to the system. What is the expected partial pressure of SO2(g) then?
An equilibrium mixture at 225 degrees C contains 0.10 M NH3 and 0.20 M H2 for the reaction 3H2 (g) + N2 (g) --- 2NH3(g) If the Kc at this temperature is 1.7 X 10 2.
Write a semi-quantitative expression which describes the lattice energy of an ionic crystal. Define and explain all terms used, and explain how they may effect the properties of the crystal.
How could you convert butanoic acid into the following compounds? Write each step showing the reagents needed. (a) 1-Butanol (b) 1-Bromobutane and (c) Pentanoic acid
chemical potential energy from rotating turbines into thermal energy. B) electrostatic energy from rotating turbines into chemical energy
Calculate the pH of a buffer tht contains 0.60M ammonium chloride
Reactions of alcohols with hydrogen halides yield the important class of compound known as alky halides. Reactivity towards the hydrogen halides with an alcohol decreases
Dry Sand has a density of 1.5g cm^-3. A child's sandbox measuring 4 ft by 5 ft is filled with sand to a depth of 6 in. What is the mass of the sand in kg. in lb
A solution containing 0.2 g/mL of a pure R enantiomer in a 1 dm polarimeter rotates plane polarized light by +3?. What is the specific rotation of the R isomer. What will be the specific rotation of its S isomer.
A room contains 46 of air.How many kilowatt-hours of energy are necessary to heat the air in the house from 9 to 30? The heat capacity of air is 1.03.
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