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A 34.9-g sample of an unknown metal, initially at 232.8oC, is immersed in a 17.0-g sample of water (specific heat = 4.184 J g-1 oC-1), initially at 15.4oC, in an insulated cup. Once equilibrium is reached, the final temperature of the water-metal mixture is 28.2oC. What is the identity of the metal?
What is the molar mass of a nonpolar molecular compound if 5.52 grams dissolved in 36.0 grams of benzene begins to freeze at -1.87 °C? The freezing point of pure benzene is 5.50 °C and the freezing point depression constant, Kfp, is -5.12 °C/m.
a 25.0 ml sample of H3PO4 requires 50.0ml of 1.50ml M NaOH for complete neutralization. what is the molarity of the acid?
3AgNO3 + Na3PO4 --> Ag3PO4 + 3NaNO3 Silver nitrate and sodium phosphate are reacted in equal amounts of 200. g each. How many grams of silver phosphate are produced?
Dissolving NH4NO3 in water is an endothermic process. In fact, this reaction is often used in cold packs sold at the drug store. When 23.8 g of NH4NO3 was rapidly dissolved in 79.5 mL of water in a coffee cup calorimeter,
An 1.07 mol sample of carbon dioxide gas at a temperature of 8.00 oC is found to occupy a volume of 22.7 liters. The pressure of this gas sample is
How can you tell when looking at organic compounds what is saturated? Here are some examples?
Calculate the following values at 25C using standard potentials as needed. E°cell, E cell, deltaG°rxn, and deltaGrxn
A water sample is suspected to be contaminated by iron (III) ions. How could you determine if the sample is really contaminated
C4H10(g) + O2(g) CO2(g) + H2O(g) Consider the above unbalanced equation. What volume of O2 at 555 mm Hg and 56.0°C is required to produce 285 mL of CO2 at 780. mm Hg and 131°C?
A 17.6-g sample of an alloy at 93.0°C is placed into 50.0 g of water at 22.0°C in an insulated coffee-cup calorimeter with a heat capacity of 9.2 J/K. If the final temperature of the system is 31.1°C, what is the specific heat capacity of the allo..
A buffer that contains 0.55 M base, B, and 0.30 M of its conjugate acid, BH+, has a pH of 8.94. What is the pH after 0.0020 mol HCl is added to 0.25 L of this solution.
Converting liquid water to solid ice releases 1.44 kcal/mol. How many kilocalories are released by freezing 2.5 mol of H2O? How many kilocalories are released by freezing 32 g of H2O.
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