How many liters of hydrogen are produced from 33.5L of zinc reacting with hydrochloric acid?

Ineed ! i have no clue how to do this problem.

Pastoral farming is best described as a. a method of raising livestock and moving herds b. an african method of agriculture c. a method of cultivating crops on poor soils d. a common method of desert farming select the best answer from the choices provided a b c d

At the current rate, a graph of carbon dioxide produced by fossil fuels over time would slope upward slope downward be horizontal be vertical