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Two students weighed a 125-ml beaker that had a mass of 80.562g on a calibrated top-loading balance. Each student used their own top-loading balance, recorded three mass readings for the beaker, and then determined the average. Below are the results: Student A Student B 80,560 80,400 80,555 79,551 80,565 81,729 A) Find the Averages B) Which set of results matches the known mass of the beaker? C) Which set of results is more precise? D) Which student has the more reliable balance?
What is the ground state electron configuration for the boron atom? What term symbols can arise from this electron configuration?
At 0.0oC, if the volume of air is 2.6 mL and the pressure of the atmosphere that day is 815 mmHg, what is the number of moles of air?
At 25 c and 1.0 atm, 0.25 g of a gas dissolves in 1.00 L of water. What mass of the gas dissolves in 1.00 L of water at 25 c and 3.0 atm?
A Chem 113 TA prepares a solution by dissolving 3.11 g of solid KOH in enough water to make 100.0 mL of solution. Calculate the molarity of K+ ions in this solution.
Calculate the concentration of ethanol in wine in terms of mass percent and molality. mass percent: (answer in percent) molality
Calculate the volume of a balloon at the final temperature if this balloon at temperature of 279K and an initial volume of 2.3L is warmed to 406K.
Rate Constant with Temperature Changes, Rearrangement of methyl isonitrile to acetonitrile has activation energy of 25.0 kJ/mol and a rate constant of 8.1*10^-4s-1 @ 80 Celsius.
A container with a volume of 101 L contains how many atoms of argon gas at STP?
How many atomsof carbon are present in 34.5 grams of caffeine?
Determine the equilibrium concentrations - what are the new equilibrium concentrations of all species.
For the unbalanced equation _Al+_O2=_Al2O3. How many moles are needed to form 2.3 moles of aluminum oxide.
If the aluminum block is initially at 25^C, what is the final temperature of the block after the evaporation of the alcohol? Assume that the heat required for the vaporization of the alcohol comes only from the aluminum block and that the alcohol ..
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