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A sample of impure sulphide contains 42.34% of Zn. Find the percentage of pure ZnS in the sample .
For the nitrogen fixation reaction 3H2(g) + N2(g) <--> 2NH3(g), Kc = 6.0 × 10-2 at 500°C. If 0.250 M H2 and 0.050 M NH3 are present at equilibrium, what is the equilibrium concentrat
A sample of H2O with a mass of 46.0 grams has a temperature of -58.0 C How many Joules of energy are necessary to heat the ice to 0 C ( Use 2.1 J/g C for the specific heat of ice).
using your knowledge of mole calculations and unit conversions determine how many atoms there are in 1 gallon. Assume that the molecular formula for gasoline is C6H14 and that the density of gasolin
A second order reaction of type A+B=P in which the reactants were present initially at a concentration of 0.02M is found to be 25% completed in 50minutes, calculate the rate constant and the half li
An experiment shows that a 153-mL gas sample has a mass of 0.171 g at a pressure of 761 mm Hg and a temperature of 32oC. What is the molar mass of the gas? R=0.0821 L atm / mol K.
A 375 mL sample of gas is initially at a pressure of 721 torr and a temperature of 32°C. If this gas is compressed to a volume of 286 mL and the pressure increases to 901 torr, what will be the
A balloon with an initial volume of 2.3L at a temperature of 279K is warmed to 406K. What is its volume at the final temperature?
Calculate the Debye lengths for 0.1 mM, 10 mM and 100 mM aqueous solutions of NaCl and MgSO4, assuming that the salts are completely ionized .
Calculate the number of grams of CoCl2 that would be required to prepare the following solutions:
What is the pressure in a 14.6 L cylinder filled with 0.440mol of nitrogen gas at a temperature of 327K ?
In a particular experiment, 1.50-g samples of each reagent are reacted. what is the theoretical yield of lithium nitride ?
N 2 (g)+O 2 (g)?2NO(g) is carried out at a temperature at which K c = 0.060. The reaction mixture starts with only the product, [NO] = 0.0400M , and no reactants. Find the equilibrium of N2O2.
Calculate the amount of heat required to heat a 3.9kg gold bar from 28°C to 68°C. Specific heat capacity of gold is 0.128 J/g°C.
A mixture of He, Ne, and N2 gases has a pressure of 1.348 atm. If the pressures of He and Ne are 0.124 atm and 0.996 atm, respectively, what is the partial pressure of N2 in the mixture?
On 200g of an ash,3.60mg of mercury was deposited on the ash. How many atoms of mercury are these?
An igneous rock originally has 3 grams of uranium-238 in it. When dated , the rock only contains 1.8 grams. What are the parent and daughter concentrations ( in percentages) and what is its age?
A rock is found to contain 3.2 grams of uranium-235, a radioactive isotope. If the rock has undergone 2.75 half lives, what was the original amount of uranium-235 in the rock and how old is the rock
The concentration of the radioactive isotope potassium-40 in a rock sample is found to be 3.125%. What is the age of the rock?
What would the percentage of thorium- 232(parent compound) be in a rock that was dated at 1.4 billion years?
A human piece of pottery is dated at 16,750 years old by using carbon-14. How many half lives have passed since the pottery was make?
Basicity comparison, compare the basicity of aniline (Pka=4.58), 3aminophenol (Pka=4.15) and 4 aminophenol(Pka=5.5).give in ascending order?
A child receives 10mg of medicine for every kilogram she weighs. How much medicine should she receive if she weighs 48 pounds and the conversion factor for pounds to kilograms is 1 pound = 0.4536kg
What is the temperature of 0.600mol of gas at a pressure of 1.3atm and a volume of 11.6L?
The volume of a gas collected when the temperature is 11 degrees Celsius and the pressure is 710 mmHg measures 14.8 ml. What is the calculated volume of the gas at 20 degrees Celsius and 740 mmHg?