Use the balanced equation below O2 + 2H2 > 2H2O

1. How many moles of hydrogen are needed to complete the reaction?

2. If 3.0 moles of oxygen are present with excess hydrogen, how many moles of water are formed?

Which type of stress results when two plates push against one another? a. compression b. tension c. force d. shear

Apeak with a retention time of 407 s has a width at half-height (w1/2) of 7.6 s. a neighboring peak is eluted 17 s later with a w1/2 of 9.4 s. a compound that is known not to be retained was eluted in 2.5 s. the peaks are not baseline resolved. how many theoretical plates would be needed to achieve a resolution of 1.5?

2points what is the job of a scientist? a. to answer ethical questions. b. to write laws based on his or her knowledge. c. to ask and answer scientific questions. d. to ignore facts that do not support his or her theory.