Late the mass of 5.1 mol of So
15 mol of No
ate the number of some
48 of carbon TV) .co.
LH0
2 g of sulphuri, 50,
2 g of propane. CH

Which position represents spring in the southern hemisphere? a) b) c) d)

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.)

Which statement best explains the relationship between an area is geography and the temperature of its surface water