What is the ratio (in the form of a decimal) of

Ответ:

mikkelf6158

20.01.2022

The ratio (in the form of a decimal) of the root-mean-square speed of 238UF6 to that of 235UF6 at constant temperature is; 0.996.

Root-mean square speed

According to the question;

The compound given are ; 238UF6 and 235UF6.Molar mass of 238UF6 = 238+114 = 352Molar mass of 235UF6 = 238+114 = 349.

By the formula for root mean square speed;

Root mean square speed is inversely proportional to the square root of the molar mass as evident in;

$v = \sqrt{ \frac{3rt}{m} }$

Therefore, the required ratio;

$\frac{ {v}^{1} }{ {v}^{2} } = \sqrt{ \frac{m2}{m1} }$

Therefore;

V1/V2 = √(349/353)V1/V2 = 0.996

coopkm24

06.10.2020

What is the mole fraction of a solution that contains 200 g of magnesium hydroxide in 225 g of water

0.215

Explanation:

Given parameters:

Mass of magnesium hydroxide = 200g

Mass of water = 225g

Unknown:

Mole fraction of solution = ?

Solution:

The mole fraction is a measurement of concentration that expresses the number of moles of solute to that of solution.

Mole fraction = $\frac{mole of solute}{moles of solution}$

A solution is made up of solute and solvent

Number of moles = $\frac{mass}{molar mass}$

Molar mass of Mg(OH)₂ = 24.3 + 2(16 + 1) = 58.3g/mol

Molar mass of H₂O = 2(1) + 16 = 18g/mol

Number of moles of Mg(OH)₂ = $\frac{200}{58.3}$ = 3.43moles solute

Number of moles of H₂O = $\frac{225}{18}$ = 12.5moles solvent

Mole fraction = $\frac{3.43}{3.43 + 12.5}$ = 0.215

0,0(0 оценок)