Group 13 elements tend to acquire which charge when they form ions?<br> -3<br> +5<br> +3<br> -5

If the aluminum block is initially at 25 ∘C, what is the final temperature of the block after the evaporation of the alcohol? As

skad [1K]

Explanation:

The given data is as follows.

Heat of vaporization ( $\Delta H_{vap}$ ) = 45.4 kJ/mol

Specific heat ( $C_{p}$ ) = 0.903 $j/g^{o}C$

Let us assume the alcohol given is $C_{3}H_{8}O$ and its mass is 1.12 g. Also, mass of aluminium block is 73.0 g.

First, calculate the moles of alcohol ( $C_{3}H_{8}O$ ) as follows.

No. of moles alcohol = $\frac{mass}{\text{molar mass}}$

= $\frac{1.12 g}{60.1 g/mol}$

= 0.0186 mol

So, heat absorbed by the alcohol ( $q_{alcohol}$ ) = heat lost by aluminium ( $q_{aluminium}$ )

$n \times \Delta H_{vap}$ = $-m \times C_{p} \times \Delta T$

$0.0186 mol \times 45.4 kJ/mol = - 73.0 g \times 0.903 J/g^{o}C \times (T_{f} - 25^{o}C)$

12.71 = $- (T_{f} - 25^{o}C)$

$T_{f} = 12.3^{o}C$

Thus, we can conclude that the final temperature of the block is 12.3^{o}C[/tex].

7 0

3 years ago

Please Help I WILL REWARD BRAINLIEST

anastassius [24]

Most earthquakes occur along the edge of the oceanic and continental plates. The earth's crust (the outer layer of the planet) is made up of several pieces, called plates. The plates under the oceans are called oceanic plates and the rest are continental plates. The plates are moved around by the motion of a deeper part of the earth (the mantle) that lies underneath the crust. These plates are always bumping into each other, pulling away from each other, or past each other. The plates usually move at about the same speed that your fingernails grow. Earthquakes usually occur where two plates are running into each other or sliding past each other.

6 0

2 years ago

If air contains 78% Nitrogen by volume, what is the solubility of nitrogen in water at 25 degree celisus

Svet_ta [14]

The solubility of nitrogen in water at 25 °C= 4.88 x 10⁻⁴ mol/L

<h3>Further explanation</h3>

Given

78% Nitrogen by volume

Required

The solubility of nitrogen in water

Solution

Henry's Law states that the solubility of a gas is proportional to its partial pressure

Can be formulated

S = kH. P.

S = gas solubility, mol / L

kH = Henry constant, mol / L.atm

P = partial gas pressure

In the standard 25 C state, the air pressure is considered to be 1 atm, so the partial pressure of N₂ -nitrogen becomes:

Vn / Vtot = Pn / Ptot

78/100 = Pn / 1

Pn = 0.78 atm

Henry constant for N₂ at 25 °c = 1600 atm/mol.L=6.25.10⁻⁴ mol/L.atm

The solubility :

$\tt S=6.25.10^{-4}\times 0.78\\\\S=4.88\times 10^{-4}~mol/L$

7 0

2 years ago

The boiling points for the homonuclear diatomic molecules in the halogen family are 85 K, 238 K, 332 K, 457 K and 610 K. Which s

patriot [66]

Answer:

$Cl_{2}$ has boiling point of 238 K

Explanation:

Boiling point depends on different intermolecular force such as molecular wight, dipole-dipole attraction force, hydrogen bonding, ionic attraction force.

Homonuclear diatomic molecules are covalent non-polar molecules and thereby free from dipole-dipole attraction force, hydrogen bonding and ionic interaction forces.

Hence, boiling point of homonuclear diatomic molecules depends solely on molecular weight.

We know, higher the molecular weight of a molecule, higher will be its boiling point. This phenomenon can be realized in terms of increasing london dispersion force with increase in molecular weight.

Decreasing order of molecular weight of halogen molecules :

$I_{2}$ > $Br_{2}$ > $Cl_{2}$ > $F_{2}$