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When 0.228 g of the hydrate ZnSO4•xH2O is heated, 0.128 grams of anhydrous ZnSO4 remains. What is the value of x in the formula for the hydrate? (hint: remember that x represents the ratio of moles of H2O to moles of hydrate compound, and that moles of hydrate compound equals the moles of anhydrous compound)
Isra fills two identical balloons at identical temperatures. She fills one with O2 gas and the other with O3 gas. Which balloon will deflate faster? Why?
A 2.32 L balloon contains helium at 1.00 atm and 25°C. How many grams of helium are contained in the balloon.
What mass of water can be heated from 36C to 100C by burning this piece of coal? Answer in units of g.
Calculate the pressure (in atm) exerted by 1.00 mole of acetylene at 125°C in a 20.0-liter container. The van der Waals constants for acetylene are: a = 20.0 L2 • atm/mol2, b = 0.100 L/mol.
The standard free energy of activation of a reaction X is 89.4 kJ mol-1 at 298 K. Reaction Y is one million times faster than reaction X at the same temperature.
What percentage of the original Ag+ remains in solution when 180 mL 2.10×10-2 M AgNO3 is added to 240 mL 3.76×10-2 M K2CrO4 ?
Explain Cyclopentadiene reacts as a diene in the the Diels-Alder reaction a great deal faster than does 1,3 butadiene.
Calculate the energy per photon of electromagnetic radiation, for a photon having a frequency of 5.16 X 10^19 Hz (h = 6.626x10^-34 J s):
CaCO3 (100.1 g/mol) has a solubility of 0.018 g/100 mL in water at 35?C. What is the value of Ksp at this temperature?
In Europe, gasoline efficiency is measured in km/L. If your car's gas mileage is 23.0 mi/gal, how many liters of gasoline would you need to buy to complete a 142-km trip in Europe?
How many moles of (NH4)3PO4 are present in 100.0 mL of 2.50 M (NH4)3PO4?
A scuba diver with a lung capacity of 5.2 L inhales a lungful of air at a depth of 45 m and a pressure of 5.5 atm. If the diver were to ascend to the surface (where the pressure is 1.0 atm) while holding her breath.
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