A student found that her mixture was 13% NH4Cl, 18% NaCl and 75% SiO2. Assuming that her calculations are correct, what did she most likely do incorrectly in her experiment? Group of answer choices The sublimation process was not complete. The extraction process was not complete. The decantation process was not complete. The filtration process was not complete. The drying process was not complete.

You have a mole of ping pong balls and want to ship them to a near-by town. You have packing boxes that measure 24 inches by 24 inches by 18 inches. How many boxes do you need to pack up all the ping pong balls? The radius of a ping pong ball is 20 mm. If you make any approximations or assumptions, please list them.

A chemist adds 110.0 of a 1.63 molcalcium bromide (CaBr 2 ) solution to a reaction flask Calculate the mass in grams of calcium bromide the chemist has added to the flask. Be sure your answer has the correct number of significant digits.

Nitroglycerine is a shock-sensitive compound that decomposes as follows:  2 C3H5N3O9(l)     -->     6 CO2(g)   +  3  N2(g)   +   ½ O2(g)   +   5 H2O(g) 10.0 kg of nitroglycerine sits in a 5.0-L cylinder.  A chemist, angry that an experiment didn’t work, foolishly kicks the cylinder, thereby inadvertently performing his last and most dramatic experiment.  The final temperature of the product mixture is 595 oC.  Assume ideal gas behavior and complete decomposition.  Calculate the total pressure (atm) in the cylinder the moment before the explosion.