Câu 2 (0.50 điểm): Cho 93.0 g kim loại X(r) ở 95.0 oC vào 300.0 g H2O(l) ở 25.0 oC, nhiệt độ cuối cùng của hệ đạt được là 27.4 oC. Xem như hệ đang xét là hệ cô lập với môi trường xung quanh. Cho biết ký hiệu của kim loại X. Nhiệt dung của một số chất được cho ở bảng bên dưới.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2

d

explanation:

no starving yourself won't it will make you lose more weight what you need to do is find out what foods make you gain weight like bread and meats with fat on