Một kim loại tạo với oxi hai oxit. Khi đun nóng 3 g mỗi oxit trong một luồng khí hiđro có dư, lượng nước lần lượt thu được là 0,679 g và 0,377 g.
a/ Tính đương lượng của kim loại trong từng oxit
b/ Định tên kim loại.

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

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?

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.