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A gas sample occupies a volume of 20cm^3 at 40 degree Celsius and at a pressure of 1.60atm. What volume will it occupy at STP?
How many grams of diphenyl (C 12H10) must be dissolved in 655 g of benzene to lower the freezing point by 3 .20ºC.
The following reaction is investigated (assume an ideal gas mixture): 2N2O(g) + N2H4(g)-> 3N2(g) + 2H2O(g) Initially there are 0.10 mol N2O and 0.25 mol N2H4, in a 10.0 L container. If there are 0.06 mol of N2O at equilibrium, how many moles of N..
Calculate How many palladium atoms will have to be laid side by side to span a distance of 4.28 mm if The radius of a palladium atom is 137 pm.?
10g of CaCO3 are treated with a solution of HCl and 1.12 litre of CO2 are produced at STP . find out the number of moles of HCl in the solution
Describe the pH of a buffer solution consisting of 100 mL containing 0.1M CH3COOH and 0.125M CH3COO- , both before and after addition of 10 mL of 0.25M HCl. Ka = 1.8 x 10-5.
What is the mol fraction Na2SO4 in a solution which is 11.5% by weight Na2SO4 (molar mass Na2SO4 = 142.06 g/mol and H2O = 18.016 g/mol)?
when ethane (C2H6) is burned, how many grams of oxygen are needed to react with 477 grams of ethane?
An unknown carbohydrate compound has the empirical formula CH2O. A solution consisting of 0.515 g of the carbohydrate dissolved in 1.717 g of acetic acid freezes at 8.8°C
How do you determine the number of protons and neutrons in an atoms' nucleus and the number of electrons in its first and second shells?
Calculate the empirical and molecular formulae of A and B. Deduce the structural formulae of A and B. State the type isoerism exhibited by A and B.
A helium-filled weather balloon has a volume of 2.4 × 102 L at 99 kPa pressure and a temperature of 0°C. What is the mass of the helium in the balloon?
determine the empirical formula of a dead alkaline battery if ofund to contain a compound of Mn and O. Its analysis gives 69.6% Mn and 34.4% O
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