Cho 70,5gam hỗn hợp CuO và Na2O tác dụng vừa đủ với 13,5g nước. a) TÍnh phần trăm khối lượng mỗi oxit trong hỗn hợp
b)Tính m dung dịch H2SO4 19,6% hoà tam hết oxit ban đầu

Dona wrote the characteristics of two types of galaxies as shown below: type a: has a large flattened core type b: does not have a regular shape which statement is correct? type a is an irregular galaxy and type b is a lens galaxy. type a is a lens galaxy and type b is an irregular galaxy. type a is a spiral galaxy and type b is an elliptical galaxy. type a is an elliptical galaxy and type b is a spiral galaxy.