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The most common source of copper (rm Cu) is the mineral chalcopyrite (rm CuFeS_2). How many kilograms of chalcopyrite must be mined to obtain 200. g of pure rm Cu?
The normal boiling points of CO and SO2 are -192c and -10c, respectively. a) At 25c and 1 atm, which gas would you expect to have a molar volume closest to the ideal value
The specific heat of ethanol is 2.44j/g times degrees celcius. How many kilojoules of energy are required to heat 50.0 g of ethanol from -20.0 degrees celcius to 68.0?
How much energy is evolved in the transition from the n = 2 to the n = 1 level for 0.5 mole hydrogen
what is the theoretical mass of xenon tetrafluoride that should form when 130 g of xenon is reacted with 100 g of f2?
Dichloromethane is produced from two successive chlorination reactions: the chlorination of methane to methyl chloride followed by the chlorination of methyl chloride to dichloromethane
How many moles of carbon monoxide react with 1 mole of oxygen gas according to the balanced chemical equation?
Ethanol (C2H5OH) is produced from the fermentation of sucrose in the presence of enzymes. C12H22O11(aq) + H2O(g) > 4 C2H5OH(l) + 4 CO2(g)
If a process is carried out at constant pressure P and the volume V of the system decreases, then is delta V negative or positive and is the work w negative, positive, or zero
The "roasting" of 48.7 g of ZnS at constant pressure gives off 220. kJ of heat. Calculate the DH for this reaction. 2ZnS(s) + 3O2(g) ® 2ZnO(s) + 2SO2(g)c
do only ionic compounds dissolve with an evolution or absorption of heat...what about molecular compounds like sucrose, glucose, aspartic acid
Estimate the temperature above which this reaction is spontaneous. DS0 = 16.1 J/K. CH4(g) + N2(g) + 163.8 kJ ® HCN(g) + NH3(g)
In the combustion reaction of 149 g of propane with excess oxygen, what volume of carbon dioxide if produced at STP?
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