Để hòa tan hết 4g oxit kim loại có hóa trị không đổi cần vừa đủ 25g dung dịch HCL 29,2 % CTHH của oxit là

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

How many moles of co2 are produced during the complete combustion of 3.6 moles of c2h6