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How many grams of BaCl2 should be added to 300 g H2O so that the freezing point of the solution is lowered – 8.3 0C ? Assume that the BaCl2 completely dissociates in the solution.
1. What will be the freezing point of an aqueous solution containing 80 g of NaCl?
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A system has constant volume (∆V=0) and the heat around the system increases by 50 J
A. What is the sign for heat (q) for the system?
B. What is ∆V equal to?
C. What is the value of internal energy of the system in Joules?
Calculate the volume of 0.400 M H3PO4 needed to react with 200.0 mL of 0.200 M NaOH.
If 0.650% solution of Na2CO3 will be used to precipitate Ca+² from solution, determine the amount of solution,in grams, needed to precipitate 5.00×10² mL of 0.01120M Ca+²?
Calculate the volume, in mL, of 1.72 M HCl solution that will react with 2.67 mol of CaCO3?
If 160 g of KCI is dissolved in water to make 500ml solution,what is the molarity of the solution?
Give examples that illustrate the use of standard heats of formation in calculating changes in enthalpy or ΔH of reactions.
State that values of standard states of formation are important because these are
conveniently used to calculate changes in enthalpy, ΔH of many reactions.
Discuss standard state and give examples (Padolina et al., 1995)
