A scientist is trying to discover information about an unknown metal in a compound. The formula for the compound is believed to be XBr, where X is the unknown metal. The scientist determined that a 4.715 g sample of this compound contains
4.740 x 10-2 mol Br. Calculate the atomic mass of the unknown metal, X.

Describe the particles of all three phases of matter in the root beer float. (how are the particles arranged and moving? )

Brainliesttt me asap! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

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.)