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A compound that contains 57.8 percent C, 3.6 percent H, and 38.6 percent O by mass. a. What is its empirical formula?
b. What is the molecular formula if the molar mass is 166 g/mol.
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Can someone me with questions 15 to 17 plz.

24. a sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °c). if the ball is then played with outside where the temperature is 7.5 °c, what will be the new pressure of the ball? assume the ball does not change in volume nor does any air leak from the ball a) 0.555 atm b) 1.74 atm c) 1.85 atm d) 1.97 atm

Ants live on acacia trees in south america. the ants feed on sugars secreted by the trees. the trees provide room for the ants to live. the ants sting any other insect or animal that comes to eat the trees. what type of relationship is this?