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The mean age of 100 children was 9.35 years. The mean age of 25 of them was 8.75 years and that of another 65 was 10.51 years. Find the mean age of the remaining children?
The standard molar enthalpy of formation of ClF3 is -405 kJ. 1/2 Cl2(g) + 3/2 F2(g) → ClF3(g)
What is the heat energy change for this in kcal. Specific heat of h2o 1.00cal/gC. How many mols of cacl2 is this. How much heat energy per mol. answer in kilocalories
Compute the molarity of an acetic acid solution if 34.57 mL of these solutions are needed to neutralize 25.19 mL of 0.1025 M sodium hydroxide.
Explain the fact that KOH is much more soluble in liquid ammonia containing a little water than in pure liquid ammonia.
A certain constant-pressure reaction is nonspontaneous at 45oC. The entropy change for the reaction is +72 J/K. What can you conclude about the sign and magnitude of the enthalpy
A concentration cell consists of two H2/H+ half cells. Half cell A has H2 at 0.87 atm bubbling into 0.20 M HCl. Half cell B has H2 at 0.40 atm bubbling into 1.3 M HCl. What is the voltage of the cell
What mass of LP gas is necessary to heat 1.4 of water from room temperature (25.0 ) to boiling (100.0 )? Assume that during heating, 14% of the heat emitted by the LP gas combustion goes to heat the water. The rest is lost as heat to the surroundi..
Styrene, a compound substance used to make Styrofoam® cups and insulation, contains 92.3 and 7.7 by mass and has a molar mass of 104 . What's the empirical formula?
How many moles of nonane (C9H20) and oxygen are required to produce 13.5 moles of carbon dioxide and 15 moles of water by complete combustion? a. 1 mole of nonane and 14 moles of oxygen
Determine the PH of each of the following a) 10mL of .2M Acetic acid and 1.00mL of .1M sodium hydroxide, and 9.0 mL of distilled water
A graduated cylinder contains 155 mL of water . A 15.0-g piece of iron (density = 7.86g/cm^3) and a 20.0-g piece of lead (density = 11.3 g/cm^3) are added. What is the new water level, in milliliters, in the cylinder? motion commented
Calcium chloride (CaCl2; very soluble) has been sold as a more effective de-icer than NaCl to spread on icy sidewalks. What would be the ionic strength of a solution
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