Be sure to answer all parts. Metal hydrides react with water to form hydrogen gas and metal hydroxide. For example,

SrH2(s) + 2H2O(l) → Sr(OH)2(s) + 2H2(g)

You wish to calculate the mass of hydrogen gas that can be prepared from 7.46 g of SrH2 and 6.22 g of H2O.

(a) How many moles of H2 can be produced from the given mass of SrH2?

moles

(b) How many moles of H2 can be produced from the given mass of H2O?

moles

(c) Which is the limiting reactant?
H2O
SrH2

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 does the xylem do? stores the glucose captures the sunlight absorbs oxygen into the leaf carries water from the roots to the leaves

The molar mass of nickel(ni) is 58.7 g/mol. how many moles are in an 88 gram sample of nickel?