Since, density is straight proportional to mass. So, much more is the fixed of one element much more will it is in its density.

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Mass of magnesium is 24.305 g/mol.

Mass of barium is 137.327 g/mol.

Mass of beryllium is 9.012 g/mol

Mass the radium is 226 g/mol.

Hence, radium has an ext mass therefore it will have the greatest density at STP.

has actually the greatest thickness at STP.

Further Explanation:

Ideal gas legislation is the equation of state for any kind of hypothetical gas. The expression because that the right gas equation is together follows:

…… (1)

Here,

P is the pressure.

V is the volume.

T is the absolute temperature.

n is the variety of moles.

R is the global gas constant.

The formula to calculate the variety of moles is as follows:

...... (2)

Here,

n is the variety of moles.

m is the mass.

M is the molar mass.

Substitute the value of n from equation (2) in equation (1).

…… (3)

Rearrange equation (3) as follows:

…… (4)

The formula to calculate density is as follows:

...... (5)Here,

is the density.

m is the mass.

V is the volume.

Substitute equation (5) in equation (4).

…… (6)Rearrange equation (6) to calculate the density.

...... (7)

At STP, T and also P remain constant, R is already a constant. So according to equation (7), density of substance is directly proportional to the molar massive of the substance.

The molar massive of scandium is 44.96 g/mol.

The molar mass of selenium is 78.97 g/mol.

The molar massive of silicon is 28.09 g/mol.

The molar massive of sodium is 22.99 g/mol.

The molar fixed of selenium is the highest among the given aspects so its density will be the greatest.

Learn more:

1. Which statement is true because that Boyle’s law:

2. Calculation of volume of gas:

Answer details:

Grade: an elderly School

Subject: Chemistry

Chapter: best gas equation

Keywords: P, V, n, R, T, appropriate gas, pressure, volume, selenium, sodium, scandium, silicon, 22.99 g/mol, 78.97 g/mol, 28.09 g/mol, 44.96 g/mol, density, molar mass.

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carbondioxide has actually highest density

Mass of barium is 137.327 g/mol. Mass of radium is 226 g/mol.

Hence, radium has more mass because of this it will have the greatest density at STP.

Hope this help