Oxygen gas can be prepared by heating potassium chlorate: 2kclo3(s)2kcl(s) + 3o2(g) in one experiment, a sample of kclo3 reacts and the gas produced is collected by water displacement. the gas sample has a temperature of 24.00 °c, a volume of 564.0 ml, and a pressure of 754.0 mm hg.
calculate the amount (in moles) of oxygen gas produced in the reaction. the vapor pressure of water is 22.38 mm hg at 24.00 °c.

The most efficient way to establish the best possible economizer position is to measure

How many atoms are there in 5.70 mol of mg

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)