How many moles is 2.17x10^23 representative particles of bromine

Balance this equation co2(g) + h2o (g) show that the balanced equation obeys the law if conversation of mass

Turbo the snail moves across the ground at a pace of 12 feet per day. if the garden is 48 feet away, how many days will it take for the snail to get there?

The identities of substances are the same before and after which type of change