4) definite shape and definite volume
<u>Given:</u>
Charge on potassium (K) = +1
Charge on selenium (Se) = -2
<u>To determine:</u>
The values of X and Y in K(X)Se(Y)
<u>Explanation:</u>
The molecule which is formed between K and Se is neutral.
The K+ and Se2- ions should combine such that the net charge on the molecule is zero.
X(K+) + Y(Se2-) = 0
X(+1) + Y(-2) = 0
The simplest solution to the above equation is obtained when X = 2 and Y = 1
Thus, the molecule would be: K₂Se₁
Ans: X = 2 and Y = 1; K₂Se₁
Explanation:
As we know that density is the amount of mass present in a liter of solution.
Mathematically, density =
As it is given that density of water is 1 g/ml and volume is 175 mL. So, mass of water will be calculated as follows.
density =
1 g/ml =
mass = 175 g
It is known that 18 g of water contains 1 mole of water. Hence, number of moles present in 175 g of water will be calculated as follows.
No. of moles =
=
= 9.72 mol
This means that we have 9.72 moles of ethanol also.
Hence, volume of ethanol present in 175 ml of water will be as follows.
No. of moles of ethanol =
9.72 mol =
Volume = 566.69 ml
Thus, we can conclude that 566.69 ml volume of ethanol contains the same number of molecules as are present in 175 ml of .
Answer:
0.200g de gas son obtenidos
Explanation:
La reacción de ácido clorhídrico, HCl, con Zn es:
2HCl(aq) + Zn(s) → ZnCl₂(s) + H₂(g)
<em>Donde 2 moles de ácido reaccionan con 1 mol de Zn para producir una mol de cloruro de cinc y una mol de hidrógeno (gas)</em>
Asumiendo que el ácido está en exceso, las moles de 6.5g de Zn (Masa molar: 65.38g/mol) son:
6.5g × (1mol / 65.38g) = <em>0.0994 moles de Zn</em>
Como 1 mol de Zn produce 1 mol de hidrógeno, las moles de hidrógeno son 0.0994 moles de H₂. En gramos (Masa molar H₂ = 2.01g/mol):
0.0994 moles H₂× (2.01g / mol) = <em>0.200g de gas son obtenidos</em>