An acid compound found in plants and vegetables such as rhubarb, has a mass percent composition of 26.7% C, 2.24% H, and 71.1% O. It can interfere with respiration and cause kidney or bladder stones. If a large quantity of rhubarb leaves is ingested, this acid can be toxic. The lethal dose (LD50) in rats for this acid is 375 mg/kg. Rhubarb leaves contain about 0.5% by mass of the acid. If the acid has an experimental molar mass of 90.0 g/mol, what is its molecular formula?

Sarah wants to know where in her garden chamomile would grow the best. she thinks chamomile will grow best in the corner of the garden that gets the most sunlight. to test her hypothesis, she decides to plant several groups of chamomile in her garden as an experiment. which of the following variables will sarah need to measure to know which group of plants grew best? a. the location of the plants b. the type of plants c. the height of the plants d. the amount of water she gives the plants

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?