All categories

3 years ago

The number of Al atoms in 0.25 mol of Al2(SO4)3

Chemistry

1 answer:

Harrizon [31]3 years ago

4 0

Answer:

3.011 × 10²³ atoms of Al

Explanation:

Given data:

Number of moles of Al₂(SO₄)₃ = 0.25 mol

Number of atoms of Al = ?

Solution:

In one mole of Al₂(SO₄)₃ there are 2 moles of Al.

In 0.25 mol × 2 = 0.5 mol

1 mole of any substance contain 6.022 × 10²³ atoms.

In 0.5 moles of Al:

1 mole contain 6.022 × 10²³ atoms.

0.5 mol × 6.022 × 10²³ atoms/ 1 mol

3.011 × 10²³ atoms

You might be interested in

Dna contains the template needed to copy itself, but it has no catalytic activity in cells. what catalyzes the formation of phos

Over [174]

I am sure it is DNA polymerase.
I'm a bio major, hope I helped :)

4 0

3 years ago

When 74.8g of alanine C3H7NO2 are dissolved in 1450.g of a certain mystery liquid X, the freezing point of the solution is 8.30°

dlinn [17]

Answer: The mass of potassium bromide that must be dissolved in the same mass of X to produce the same depression in freezing point is 58.2 grams

Explanation:

Depression in freezing point is given by:

$\Delta T_f=i\times K_f\times m$

$\Delta T_f=T_f^0-T_f=8.30^0C$ = Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte)

$K_f$ = freezing point constant =

m= molality = $\frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}=\frac{74.8g\times 1000}{1450g\times 89.09g/mol}=0.579$

$8.30^0C=1\times K_f\times 0.579$

$K_f=14.3^0C/m$

Let Mass of solute (KBr) = x g

$8.3^0C=1.72\times 14.3\times \frac{xg\times 1000}{119g/mol\times 1450g}$

$x=58.2g$

Thus the mass of potassium bromide that must be dissolved in the same mass of X to produce the same depression in freezing point is 58.2 grams

7 0

2 years ago

Choose the molecule or compound that exhibits dipole-dipole forces as its strongest intermolecular force.

LuckyWell [14K]

Answer:

SO2

Explanation:

Dipole-Dipole exist between parmanent dipoles in a molecule. THis means that molecule must have a parmanent dipole moment in it.

Example - HCl

Hydrogen bonding is an attraction between lone pair of an electronegative element and H atom of same or different molecule. H must be covalantly attached to either F, N or O.

Example - H2O

Among the molecules given in the list only SO2 and H2O exihibits parmanent moment. As BCl3 , CBr4 and H2 are symmetric compounds.

Since, SO2 cannot exihibit H- bonding only dipole-dipole forces as its strongest intermolecular force.

5 0

3 years ago

Some covalent compounds contain atoms of just one element. true or false?

kifflom [539]

True, because diatomic elements (H2, O2, F2, Br2, I2, N2, Cl2) consist of only one element but are molecules with covalent bonds.

6 0

3 years ago

Please help me with this question

vlada-n [284]

The answer to that question is B

7 0

3 years ago

The number of Al atoms in 0.25 mol of Al2(SO4)3​

The number of Al atoms in 0.25 mol of Al2(SO4)3