Assuming an ideal situation, calculate the vapour pressure of a solution composed of equal mole fraction of benzene C6H6 and toluene C7H8 at 250C. Given the vapor
pressure of pure benzene and pure toluene is 95.1

and 28.4 mm Hg respectively.​

Draw the more stable lewis dot structure for bro2-

What is the density of the black hole

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.)