How many grams of Mg could you make from 20.00 g of Li? MgF(2) + 2 Li —> Mg + 2 LiF

These are the molar masses for each :

MgF(2) = 62.3g/mol
Li = 6.9g/mol
Mg = 24.3g/mol
LiF = 25.9g/mol

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

answerto predict;

it has both hydrogen and oxygen