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A standardized weight obtain from the National Bureau of Standards has the value of 20.000g. While it was used to calibrate a student's top loading balance, the balance showed the following readings; 19.995, 20.005, 20.001. Comment on the precision as well as accuracy of the balance.
The electrolysis of molten A12O3 at 980 ºC is used to produce metallic aluminum. A current of 658 A is used in the electrolysis cell. What is the rate of formation of aluminum, in kilograms per hour
A certain metal, M, forms two oxides, M2O and MO. If the percent by mass of M in M2O is 73.4%, what is its percent by mass in MO?
How many grams of O2 are needed to react with 18.5 grams of Mg? 2 Mg(s) + O2(g) → 2 MgO(s)
The bromocresolgreen end point of the titration was reached after the addition of 30.00 mL of hydrochloric acid solution. Calculate the concentration of the acid solution.
Polly Esther determined the Ca2+ ion content of a 100 mL sample of calcium fortified orange juice. After adding 2.0 M HCl solution to the sample, she filtered the juice to remove the pulp and other particulate matter
What is the specific heat of a substance that requires 124 J to raise temperature of 95.5 g from 20.0 degrees celsius to 25 degrees celsius?
Calculate the entropy change for each of the following reactions. Justify why these are physically reasonable answers.
How Much Chlorine Must be Added to a Swimming Pool? A solution used to chlorinate a home swimming pool contains 7% chlorine by mass. An ideal chlorine level for the pool is one part per million (think of 1 ppm as being 1 g chlorine per million gra..
If 1.0 atm H2S (g) are added to a 1.0 L flask containing an excess of I2 (s), what will be the equilibrium pressure of HI?
I do not understand how to draw the skeletal structure of (CH3)3CCH2CHC(CH3)2 and (CH3)2CHCHCHC(CH3)3
the heat of combustion for a sample of coal is 23.0 kjg. how many grams of coal must be burned to heat 220.0 g of water
Argon gas is 10 times denser than helium gas at the same temperature and pressure. Which gas is predicted to effuse faster? How much faster? Please tell me which gas is predicted to effuse faster and why
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