What is the slow, rate-determining step, in the acid-catalyzed dehydration of 2-methyl-2-propanol?

H2SO4
(CH3)3COH →

a. Protonation of the alcohol to form an oxonium ion.
b. Loss of water from the oxonium ion to form a carbocation.
c. Loss of a β-hydrogen from the carbocation to form an alkene.
d. The simultaneous loss of a β-hydrogen and water from the oxonium ion.

As a part of an experiment a student burns propane to produce carbon dioxide and water she remembers that she must follow the law conservation of matter when writing a balanced chemical equation which of these equation adheres to the law of conservation of matter

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

What is the molar mass of a gas that has density of 2.054 g/l