if 4.50 g of the unknown compound contained 0.150 mol of c and 0.300 mol of h, how many moles of oxygen, o, were in the sample?

What percentage of the earth's water is available for use by living things?

Which of the following best describes the difference between “autobiography” and “memoir”? a. autobiography is written about the author's own interpretation of events; memoir is a written interpretation of events. b. memoir covers a particular time in the writer’s life or recounts life events around one or two themes; autobiography covers the entire story of the author's life and has multiple themes. c. autobiography covers the entire story of the writer's life and has multiple themes; memoir is a shorter written work with one theme. d. autobiography covers entire story of the writer's life and has multiple themes; memoir is the writer’s random memories about past experiences.

Which of the following is a presentation cue? a. crossing your arms b. mumbling c. repeating words d. whistling