Hoà tan hoàn toàn 4,05g nhôm vào 500g dung dịch HCL thu được V (lít) khí (đktc). a) Tính V
b) Tính nồng độ % của dd axit đã dùng
c) Biết Al = 27 , H =1 , Cl = 35,5

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

it would be a gas formation

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a