What pressure will be exerted by 10 moles of hydrogen gas in a 7.5 l cylinder at 20°c? (given: r = 8.314 l∙kpa/k∙mol) 3248 kpa 24360 kpa 324.8 kpa 24.36 kpa 0.2436 kpa

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.)

What is the lowest number energy level where a d sublevel is found

What are the constituent metals of stainless steel?