Cho 2,8 gam hỗn hợp CuO , MgO , Fe2O3 tác dụng vừa đủ với 50ml dung dịch H2SO4 1M . Cô cạn dung dịch sau phản ứng thu được m gam muối . Tính giá trị của m

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

i dont know the answe

idk what is it? is this a question that you know the answer or u dont