Hydrogen and oxygen react under a specific set of conditions to produce water according
to the equation
2 H2(g) + O2(g) + 2H2O(g).
How much oxygen would be required to
produce 4.4 mol of water?
Answer in units of mol.

In a closed or isolated system , matter can not be created or destroyed. it can change forms but is conserved true or false

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?