What is the hydridization of TeBr4

6020000 in scientific notation

kobusy [5.1K]

6.02 x 10^6

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7 0

2 years ago

How many grams of aluminum are required to react with 35 mL of 2.0 M hydrochloric acid, HCl?__ HCl + __ Al --> __ AlCl3 + __

kiruha [24]

Answer:

0.6258 g

Explanation:

To determine the number grams of aluminum in the above reaction;

determine the number of moles of HCl
determine the mole ratio,
use the mole ratio to calculate the number of moles of aluminum.
use RFM of Aluminum to determine the grams required.

Moles of HCl

35 mL of 2.0 M HCl

2 moles of HCl is contained in 1000 mL

x moles of HCl is contained in 35 mL

$x \: mol \: = \: \frac{2 \: \times \: 35}{1000} \\ = 0.07 \: moles \:$

We have 0.07 moles of HCl.

Mole ratio

Balanced equation

6HCl(aq) + 2Al(s) --> 2AlCl3(aq) + 3H2(g)

Hence mole ratio = 6 : 2 (HCl : Al

but moles of HCl is 0.07, therefore the moles of Al;

$= \frac{2}{6} \times 0.07 \\ \: = 0.0233333 \: moles$

Therefore we have 0.0233333 moles of aluminum.

Grams of Aluminum

We use the formula;

$grams \: = moles \: \times \: rfm$

The RFM (Relative formula mass) of aluminum is 26.982g/mol.

Substitute values into the formula;

$= 0.0233333 \: moles \: \times \: 26.982 \: \frac{g}{mol} \\ = 0.625799 \: grams$

The number of grams of aluminum required to react with HCl is 0.6258 g.

3 0

2 years ago

Determine how many valence electrons magnesium contains

yanalaym [24]

There are two valence electrons.

6 0

2 years ago

What is the mole fraction of each component if 3.9 g of benzene (C6H6) is dissolved in 4.6 g of toluene (C7H8)

Savatey [412]

Answer:

Step 1 of 6

(a)

The mass of benzene is , so calculate the moles of benzene as follows:

The mass of toluene is, so calculate the moles of toluene as follows:

Now, calculate the mole fraction as follows:

Therefore, the mole fraction of benzene and toluene is and respectively.

Step 2 of 6

(b)

The formula to calculate the partial pressure is as follows:

Here, is the partial pressure of benzene, is the vapour pressure of pure benzene and is the mole fraction of benzene.

Vapour pressure of pure benzene at is.

Substitute the values in the equation as follows:

Therefore, the partial pressure is .

Step 3 of 6

(c)

Vapor pressure of the solution at 1 atm is .

When the total pressure of the vapour pressure of the mixture is at a temperature, then, the solution boils. It corresponds to the boiling point of the solution.

Calculate the total pressure of the solution at as follows:

Since, the total pressure is less than the atmospheric pressure, the solution will not boil at .

Calculate the total pressure of the solution at as follows:

Since, the total pressure is greater than the atmospheric pressure, the solution will boil at .

Therefore, the boiling point of the solution is .

Step 4 of 6

(d)

Mole fraction of benzene at is calculated as follows:

Mole fraction of toluene at is calculated as follows:

Therefore, the mole fractions of benzene and toluene are and respectively.

Step 5 of 6

(e)

Vapor pressure of benzene at is .

Partial pressure of benzene is calculated as follows:

Vapor pressure of toluene at is .

Partial pressure of toluene is calculated as follows:

Step 6 of 6

Weight composition of the vapour that is in equilibrium with the solution is calculated as follows:

Explanation:

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4 0

2 years ago

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In order for matter or energy to be conserved, one must have a ____ system.

Leya [2.2K]

Closed system. If the system is not closed, matter or energy can escape from the system. an example of this is if you react magnesium and hydrochloric acid in a open system. The H₂ gas is going to escape making it look like some of the mass disappeared . in that same reaction some in an open system will also loose heat to the surrounding which will make it look like less heat was produced.

6 0

2 years ago

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