Question

[Hoàng Khỏe]

Tìm cthh cua hop chat gom nguyen to R hoa tri 5 voi oxi va phan tu khoi cua chat do voi hidro la 71

Answer 1

[Nguyen Quynh Huong]

CT: R₂O₅

theo đề => R₂O₅ = 71 .2 = 142

=> 2R + 80 = 142 => 2R = 62 => R = 31

=> CT: P₂O₅