Answer:
(A) 4×0.0001M
Explanation:
[OH-] = 10^-3.4 which is equivalent to 4×0.0001M
Wear face mask and holy the conical flask or test tube away from your face and body and dont put it on directly on fire or it
Given the mass of aluminum sulfide
= 21.0 g
Molar mass of
= 
Calculating the moles of
:

Each mole
has 3 mol S.
Each mole S constitutes 
Calculating atoms of S in 0.14 mol
:

= 
Answer:
density = 4.763pounds per liter
Explanation:
1g/cm³ = 2.205pounds per liter
2.16g/cm³ = (unknown)pounds per liter
(unknown)pounds per liter = 2.205 x 2.16 = 4.763
density = 4.763pounds per liter