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The freezing point depression of water is a rather small 1.86 deg C kg/mol. Addition of 0.454 g of zinc chloride to 3.33 g of water lowers the melting point by 5.2 deg C. Calculate the expected melting point for this mixture and account for any difference.
What is the purpose of Sodium phosphate dibasic when used to make ethanol via fermentation?
How high will a hot air balloon rise if the temperature inside is maintained at 330 K? Assume that the ambient temperature is 300 K. Assume that the pressure inside and outside are the same, but the density inside is reduced by heating
A 0.160 g sample of rock was found to have 2.11 × 10-6 mol of potassium-40 (t1/2 = 1.3 × 109 yr) and 2.11 × 10-6 mol of argon-40. How old was the rock? (What assumption is made about the origin of the argon-40?)
How many mls of 12M Acetic Acid must be added to 500 ml of 0.5M Sodium acetate to prepare a buffer of pH 4.76 (pKa of Acetic Acid is 4.76).
How much energy is required to boil 45.5g of water at 100 degrees C at sea level? The molar heat of vaporization of water is 40.6 kJ/mol.
The following isotopic cluster was observed in a mass-spectrum of a parent peak of a halogenated compound:
Calculate DE, and determine whether the process is endothermic or exothermic for the following cases: A system releases 29 kJ of heat to the surroundings and does 226 kJ of work on the surroundings.
A buffer contains 0.010 mol of lactic acid (pKa=3.86) and 0.050 mol of sodium lactate per liter. Calculate the change in pH when 5mL of 0.5M NaOH is added to 1L of the buffer.
Electrolysis is used to gold plate jewelry made of stainless steel. a) what half reaction takes place to plate Au^3+ on a stainless steel earring? b) is the earring the anode or cathode? c) why is energy needed to gold plate the earring
How many moles of NiCl can be formed in the reaction of 5.00 mol of Ni and 10.0 mol of HCl
Calculate the of the following solutions and report it to the correct number of significant figures: Seawater with H3O = 7.0×10?9
Consider the decomposition of calcium carbonate. Assume that ?H° = 177.8 kJ/mol and ?S° = 160.5 J/K·mol for the temperature range.
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