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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)?
Determine the amount of heat (in kJ) given off when 1.89 104 g of ammonia are produced according to the following equation. Assume that the reaction takes place under standard-state conditions at 25.0°C.
What is the percent by mass of a solution in which 60. g of NaOH are dissolved in sufficient water to make 100 g of solution.
Calculate the pressure that must be applied in order to increase its density by 0.08 percent.
if a 2.743g sample of MgSO4 7H2O were heated strongly, what would be the expected mass of the cooled dehydrated salt? (use M=246.471g mol-1 as the molar mass of MgSO4 7H2O.
Salicylic acid, used in the synthesis of aspirin, has mass composition 60.87% C, 4.38% H, and 34.75% O. What is the empirical formula of the compound.
An aqueous solution of ethanol, C2H5OH, is 19.00% ethanol by mass and has a density of 0.9700 g mL-1. Calculate the molarity of the ethanol solution.
a gas company in massachusetts charges $2.80 for 15ft^3 of natural gas at 20 degrees C and 1 atm. Calculate the cost of heating 200mL of water from 20 degrees C to 100 degrees C.
What is the empirical formula of a compound that is composed of 1.67 g of cerium and 4.54 g of iodine.
The precipitate of CaC2O4, weighed 1.437 grams determine the molarity of calcium chloride in the solution?
In the haloform reaction, once the first alpha-hydrogen atom is replaced by a halogen atom, each successive hydrogen is more easily substituted
If a 2.743g sample of MgSO4.7H2O were heated strongly,what would be the expected mass of the cooled dehydrated salt
Calculate the amount of heat trasnferred when 3.55 g of Mg(s) reacts at constant pressure. 2Mg(s) + 02(g) ---> 2MgO(s) heat= -1204kJ
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