1, chat khi co cong thuc hoa hoc la X . biet rang 3, 36 lit chat khi do ( o dieu kien tieu chuan ) nang 4, 2 gam .
a, xac dinh cong thuc hoa hoc cua chat khi do
b, can tron them vao 3, 36 lit khi do bao nhieu lit khi hidro de duoc hon hop khi nang 4,6 gam , biet rang the tich khi do o dieu kien tieu chuan ( dktc )
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a , n=3,36:22,4=0,15mol
=>M=4,2:0,15=28
=>chất khí là N2