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Calculate total number of optical isomers in the following compound CH3(CHOH)3CH3 ??

A chemist did an experiment and mixed baking soda with vinegar. She collected CO2 in a balloon. But there was also water vapor in the balloon. If the total pressure of the gas collected was 2.76 atm and the temperature was 290C, what was pressure of CO2?

How do you solve the inequality #2 x 5 > 32#?

How to differentiate with respect to 'x'
y=cos^(1){2x √(1x^(2))} ?