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While 1 mole of H2S(g) reacts with H2O(l) to form H2(g) as well as SO2(g) according to the subsequent equation, 295 kJ of energy are absorbed. H2S(g) + 2 H2O(l) 3 H2(g) + SO2(g) Is this endothermic or exothermic? Explain what is the value of q?
The heat of formation of MnO is -385 kj/mol and that of Al2O3 is -1670 kj/mol. What is the heat of the reaction in kj
A cube of an unknown metal measures 1.61 mm on one side. The mass of the cube is 36mg.
element z has two isotopes: one has mass number of 19.0 amu is 55.0% abundant,and the isotope with mass number 21.0 amu is 45.0% abundant. what is the average atomic mass for element Z?
Acetic acid (C2H4O2) is weak acid. Write the equilibrium chemical equation for an aqueous solution of acetic acid. Derive the acid dissociation constant (Ka) from the chemical equation at equilibrium.
A 4.80 g nugget of pure gold absorbed 298 J of heat. What was the final temperature of the gold if the initial temperature was 24.0°C? The specific heat of gold is 0.129 J/(g·°C).
The absorbance of the unknown solution before the addition of the standard was 0.5622, and after the addition of the standard was 0.7822.
What mass of Al (26.89 amu) is consumed when 800. kJ of heat are released by the following reaction? 2Al(s) + Fe2O3(s) -> 2Fe(s) + Al2O3(s) deltaH = -850. kJ
0.300 moles of an unknown monobasic weak acid are added to 1.20 l of water. the resulting solution has a ph of 8.800.
If the sample reacted completely and produced 2297 mL of carbon dioxide at 24.88 °C and 736.6 mm Hg, what was the mass percentage of MgCO3 in the mixture
A solution is composed of 1.60 mol cyclohexane (P=97.6 torr) and 2.10 mol acetone (P=229.5 torr). What is the total vapor pressure Ptotal above this solution? Express your answer numerically in torr.
Calculate the final temperature when a 20.4 gram sample of ice at 0oC is placed into a styrofoam cup containing 111 grams of water at 72.7 oC. Assume that there is no loss or gain of heat from the surroundings.
How many liters of water vapor are produced when 21.7g of NH4NO3 decomposes. b.) How many grams of NH4NO3 are needed to produce 16.0L of oxygen
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