7. What is the concentration of a solution with a volume of 0 50 L that contains 40.0 sodium hydroxide (NaOH)?
grams of
a. 0.10 M
b. 0.50M
c. LOM
d. 20 M

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante

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

5.6⋅10−^19  j

do you need the explaination?