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sineoko [7]
2 years ago
6

Which of the following is required for a reaction to occur?

Chemistry
1 answer:
dezoksy [38]2 years ago
8 0
I WOULD SAY d. ALL OF ABOVE
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The process that describes the transfer of heat through matter by activity of the molecules would be conduction. This type of heat transfer due to the motion of electrons and ions. within a body. As molecules collide with each energy is transferred and released which cause temperature to rise or drop.<span />
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Determine the number of atoms in 5.88 moles sodium.
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1 mole ------------ 6.02x10²³ atoms
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Why does an ionic compound conduct an electric current when the compound is melted but not when it is in the solid state?
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3 years ago
In a laboratory experiment, students synthesized a new compound and found that when 7.229 grams of the compound were dissolved i
STALIN [3.7K]

The question is incomplete, here is the complete question:

The common laboratory solvent chloroform is often used to purify substances dissolved in it. The vapor pressure of chloroform, CHCl₃, is 173.11 mm Hg at 25°C.

In a laboratory experiment, students synthesized a new compound and found that when 7.229 grams of the compound were dissolved in 207.8 grams of chloroform, the vapor pressure of the solution was 170.51 mm Hg. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight of this compound?

<u>Answer:</u> The molecular mass of the compound is 481.9 g/mol

<u>Explanation:</u>

The equation used to calculate relative lowering of vapor pressure follows:

\frac{p^o-p_s}{p^o}=i\times \chi_{solute}

where,

\frac{p^o-p_s}{p^o} = relative lowering in vapor pressure

i = Van't Hoff factor = 1 (for non electrolytes)

\chi_{solute} = mole fraction of solute = ?

p^o = vapor pressure of pure chloroform = 173.11 mmHg

p_s = vapor pressure of solution = 170.51 mmHg

Putting values in above equation, we get:

\frac{173.11-170.51}{173.11}=1\times \chi_A\\\\\chi_A=0.0150

This means that 0.0150 moles of compound is present in the solution

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Moles of compound = 0.0150 moles

Given mass of compound = 7.229 g

Putting values in above equation, we get:

0.0150mol=\frac{7.229g}{\text{Molar mass of compound}}\\\\\text{Molar mass of compound}=\frac{7.229g}{0.0150mol}=481.9g/mol

Hence, the molecular mass of the compound is 481.9 g/mol

5 0
2 years ago
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