Hydrochloric acid reacts with calcium to form hydrogen and calcium chloride. if 100grams of hydrochloric acid reacts with 100 grams of calcium, how much of the excess reagent will be left over after the reaction is complete?

Construct the hypothetical phase diagram for metals a and b between room temperature (20c) and 700c, given the following information: * the melting temperature of metal a is 480c. • the maximum solubility of b in a is 4 wt% b, which occurs at 420c. • the solubility of b in a at room temperature is 0 wt% b. • one eutectic occurs at 420c and 18 wt% b–82 wt% a. • a second eutectic occurs at 475c and 42 wt% b–58 wt% a. • the intermetallic compound ab exists at a composition of 30 wt% b–70 wt% a, and melts congruently at 525c.• the melting temperature of metal b is 600c. • the maximum solubility of a in b is 13 wt% a, which occurs at 475c. • the solubility of a in b at room temperature is 3 wt% a.

What pressure will be exerted by 0.675 moles of a gas at 25*c if it is in a 0.750-l container?

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.