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What is the empirical formula of a compound that contains 49.4% K, 20.3% S, and 30.3% O by mass?
if the initial water level in the graduated cylinder is 21.2 ml and the level rises to 27.7 ml after the object is
A pure titanium cube has an edge length of 2.71in How many titanium atoms does it contain. Titanium has a density of 4.50 g/cm^3
Carbon-14 has a half-life of 5730 years. A sample of carbon with a mass of 0.120 g has an activity of 40 decays/hr. The initial specific activity is assumed to have been 900 decays/hr/gram. How old is the sample
The half-life of tritium (31H) is 12.3 years. If 47.0 mg of tritium is released from a nuclear power plant during the course of a mishap, what mass of the nuclide will remain after 24.6 years?What mass of the nuclide will remain after 98.4 years?
When the following equation is balanced using the smallest possible integers, what is the exponent of H2O in the reaction quotient expression
tap water with a Cl- ion concentration of 1*10^-5 mol/L? Ksp=1.77*10^-10
Find the activity coefficient of H+ in a solution containing 0.010 M HCl plus 0.040 M KClO4
Consider the following reaction at constant P. Use the information here to determine the value of ?Ssurr at 355 K. Predict whether or not this reaction will be spontaneous at this temperature.
25.0 mL of a gas with a pressure of 1.00 atm is contained in a balloon at 25.0 C. The balloon is then cooled to 5.0 C, and the pressure is found to be 0.750 atm. What is the volume of the gas under the new conditions?
The vapor pressure of ethanol is 100. mmHg at 34.9°C. What is its vapor pressure at 53.5°C. (?Hvap for ethanol is 39.3 kJ/mol.) _____ mmHg
What is the final temperature of spoon + coffee? (Assume that the heat capacity of the spoon is the same as that of pure iron and that the heat capacity of the coffee is the same as that of pure water.)
What is the molar mass of the following: a) O2, b) KH2PO4, c) Fe(ClO4)3, d) C4H8O4, e)Ga2(CO3)3, f) KBrO4. Please use significant figures.
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