Question :
119. When blue copper(II) sulfate pentahydrate heated, it decomposes according : 1335450
119. When blue copper(II) sulfate pentahydrate is heated, it decomposes according to the equation given below, forming light blue copper(II) sulfate and water vapor.
CuSO4?5H2O(s) ? CuSO4(s) + 5H2O(g)
If a 5.00 g sample of CuSO4?5H2O is heated, how many g of CuSO4 will be formed when the reaction is complete?
120. When potassium metal is exposed to air, it forms a coating of potassium oxide, according to the equation:
4K(s) + O2(g)? 2K2O(s)
If a piece of potassium gains 0.354 g, assuming this gain can be attributed to the above reaction with oxygen, what mass of oxygen reacted with the potassium?
121. When potassium metal is exposed to air, it forms a coating of potassium oxide, according to the equation:
4K(s) + O2(g)? 2K2O(s)
If a piece of potassium gains 0.354 g, assuming this gain can be attributed to the above reaction with oxygen, what mass of potassium reacted?
122. When potassium metal is exposed to air, it forms a coating of potassium oxide, according to the equation:
4K(s) + O2(g)? 2K2O(s)
If a piece of potassium gains 0.354 g, assuming this gain can be attributed to the above reaction with oxygen, what mass of K2O formed?
123. Given the unbalanced equation:
Cr(s) + Cl2(g) ? CrCl3(s)
Balance the equation, and determine how many grams of chromium would be required to react completely with 4.50 g of chlorine.
124. Given the equation for the combustion of octane:
2C8H18(l) + 25O2(g) ? 16CO2(g) + 18H2O(g)
If 50.0 g of each reactant are available, how much CO2 will be formed?
125. An aqueous solution containing 15.0 g of NaOH is mixed with an aqueous solution containing 15.0 g of H2SO4. Write a balanced equation for the reaction that will occur.
126. An aqueous solution containing 15.0 g of NaOH is mixed with an aqueous solution containing 15.0 g of H2SO4. Identify the limiting reactant.
127. An aqueous solution containing 15.0 g of NaOH is mixed with an aqueous solution containing 15.0 g of H2SO4. Will the solution be acidic or basic when the reaction is complete?
128. In photosynthesis, plants convert carbon dioxide and water into glucose, C6H12O6, according to the reaction:
6CO2(g) + 6H2O(l) ? 6O2(g) + C6H12O6(g)
How many grams of glucose can be synthesized from 117 g of CO2, assuming there is sufficient water to react with all of the CO2?
129. In photosynthesis, plants convert carbon dioxide and water into glucose, C6H12O6, accordingto the reaction:
6CO2(g) + 6H2O(l) ? 6O2(g) + C6H12O6(g)
If 75.2 g of glucose are obtained, what is the percent yield of the reaction?
130. The combustion of 16.0 g of methane gas produces 8.90 ? 102 kJ of energy. Convert this energy to units of calories.
131. How much heat must be added to 125 g of copper (C = 0.377 J/g? C) at 25.0?C to raise its temperature to 78.4?C?
132. The heat change that accompanies the formation of 1.00 mole of CO from its elements is -110.5 kJ/mol. What heat change would occur if 2.35 mol of CO were formed?
133. The burning of a 2.50 g sample of cheese pizza in a bomb calorimeter gives off 2.53 ??104 J of energy. If the calorimeter contains 2350 g of water, what was the temperature change of the water? (Cwater = 4.184 J/g??C)
