How many moles of methane (CH4) are there in 87.5g of methane (CH4)?

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.

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?