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How many moles of urea (60. g/mol) must be dissolved in 100 g of water to give a 2.5 molal solution?
what is the change in pH after addition of 10.0mL of 1.0M sodium hydroxide to 90.0mL oof a 1.0M NH3/1.0M NH4+ buffer? (Kb for ammonia is 1.8 X 10-5)
particular sample of pure iron requires 0.595 kJ of energy to raise its temperature from 25oC to 45oC. The specific heat of iron is 0.45 J/g oC. What must be the mass of the sample?
Important information about Galvanic cell, Consider a galvanic cell consisting of Sn wire immersed in a solution containing 10^-10 M Sn(NO3)subscript 2 and 1 M HNO3 and Ag wire immersed in 10^-2 M AgNO3 and 1 M HNO3.
Two moles of potassium chloride and three moles of oxygen are produced from the decomposition of two moles of potassium chlorate, KClO3(s). Write the balanced equation. How many moles of oxygen are produced from 12 moles of potassium chlorate?
calculate the total heat (in J) needed to convert 20.0g ice at -8.00 c to liquid water at 0.600c? melting point at 1 atm
Calculate the amount of heat required to completely sublime 78g of solid dry ice at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3kJ/mol .
Free radicals are also important in many environmentally significant reactions. For example, photochemical smog, which forms as a result of the action of sunlight on air pollutants, is formed in part by the following two steps.
A 5.0 g sample of a hydrate of BaCl2 was heated, and only 4.3 g of the anhydrous salt remained. What percentage of water was in the hydrate?
Determine the structure of one active component and identify three functional groups on each molecule. Based on the functional groups present in the drug molecules, predict the physical properties of the molecule the drug would interact
What is the percent hydrogen (H) by weight of a solution containing 53.5mL of CH3COCH3? The density of acetone is 0.788 g/mL
Consider the following reaction: 2H2O + 2SO2 2H2 + 3O2 A reaction mixture initially contains 2.8M H2O and 2.6 M SO2.
The temperature of a 35.2 g sample of iron increases from 23.7 °C to 29.5 °C. If the specific heat of iron is 0.450 J/g-K, how many joules of heat are absorbed?
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