During a laboratory experiment, a group of students observe and note the following information in their lab notebooks.
Observations
• Requires red blood cells to carry
out oxygen
• Contains arteries, veins, and
capillaries
• Intercellular fluid, for the exchange
of materials between tissues and
cells
Which human system does the table describe?
A) Digestive system
B) Circulatory system
C) Respiratory system
D) Integumentary system

The zinc within a copper-plated penny dissolves in hydrochloric acid if the copper coating is filed down in several spots (so that the hydrochloric acid can reach the zinc). the reaction between the acid and the zinc 2h+(aq)+zn(s)→h2(g)+zn2+(aq) . when the zinc in a certain penny dissolves, the total volume of gas collected over water at 25 °c is 0.947 l at a total pressure of 743 mmhg . (vapor pressure of water is 23.78 mmhg at 25 °c .) what mass of hydrogen gas is collected? answer in appropriate significant figures