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3 years ago

Given the equation representing a system at equilibrium N2(g)

Chemistry

1 answer:

RoseWind [281]3 years ago

8 0

Answer:

Decreasing the temperature of the system will shift the reaction rightward.

Explanation:

The complete question is:

Given the equation representing a system at equilibrium:

N₂(g) + 3H₂(g) ⇌ 2NH₃(g) + energy

what changes occur when the temperature of this system is decreased?

<h2>Solution</h2>

Modifying the temperature of a system in equilibrium changes the equilibrium constant and the equilibrium position (concentrations) of the system.

When the temperature is decreased, following LeChatelier's principle that the system will react in a way that seeks to counteract the disturbance, the reaction will shift toward the reaction that produces more heat energy to compensate the temperature decrease.

Thus, decreasing the temperature of the system will favor the forward reaction, more N₂(g) and H₂(g) will be consumed and more NH₃(g) and energy will be produced. Hence, the equilibrium will shift rightward.

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Benzene has a formula of C6H6 and a vapor pressure of 96.4 torr at 298 K. Toluene has a formula of C7H8 and a vapor pressure of

Slav-nsk [51]

Answer: The vapor pressure of the solution is 55.2 torr

Explanation:

$p_1=x_1p_1^0$ and $p_2=x_2P_2^0$

where, x = mole fraction in solution

$p^0$ = pressure in the pure state

According to Dalton's law, the total pressure is the sum of individual pressures.

$p_{total}=p_1+p_2$ $p_{total}=x_Ap_A^0+x_BP_B^0$

x = mole fraction = $\frac{\text {moles}}{\text {total moles}}$

Given : 299 g of toluene and 391 g of benzene.

moles of toluene = $\frac{\text{Given mass}}{\text {Molar mass}}=\frac{299g}{92g/mol}=3.25moles$

moles of benzene= $\frac{\text{Given mass}}{\text {Molar mass}}=\frac{391g}{78g/mol}=5.01moles$

Total moles = moles of solute (toluene) + moles of solvent (benzene) = 3.25 + 5.01 = 8.26

$x_{benzene}$ = mole fraction of benzene = $\frac{3.25}{8.26}=0.39$

$x_{toluene}$ =mole fraction of toluene = (1-0.39) = 0.61

$p_{benzene}^0=96.4torr$

$p_{toluene}^0=28.9torr$

$p_{total}=0.39\times 96.4+0.61\times 28.9=55.2torr$

Thus the vapor pressure of the solution is 55.5 torr

6 0

3 years ago

How many grams of ZnCl2 will be produced from 26.0g of Zn and 42.0g of HCl. Round to three significant figures

makvit [3.9K]

Answer: The mass of zinc chloride produced in the reaction is 54.1 grams

Explanation:

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

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

For zinc:

Given mass of zinc = 26 g

Molar mass of zinc = 65.4 g/mol

Putting values in equation 1, we get:

$\text{Moles of zinc}=\frac{26g}{65.4g/mol}=0.397mol$

For HCl:

Given mass of HCl = 42 g

Molar mass of HCl = 36.5 g/mol

Putting values in equation 1, we get:

$\text{Moles of HCl}=\frac{42g}{36.5g/mol}=1.150mol$

The chemical equation for the reaction of zinc and HCl follows:

$Zn+2HCl\rightarrow ZnCl_2+H_2$

By Stoichiometry of the reaction:

1 mole of zinc reacts with 2 moles of HCl

So, 0.397 moles of zinc will react with = $\frac{2}{1}\times 0.397=0.794mol$ of HCl

As, given amount of HCl is more than the required amount. So, it is considered as an excess reagent.

Thus, zinc metal is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

1 mole of zinc produces 1 mole of zinc chloride

So, 0.397 moles of zinc will produce = $\frac{1}{1}\times 0.397=0.397moles$ of zinc chloride

Now, calculating the mass of zinc chloride from equation 1, we get:

Molar mass of zinc chloride = 136.3 g/mol

Moles of zinc chloride = 0.397 moles

Putting values in equation 1, we get:

$0.397mol=\frac{\text{Mass of zinc chloride}}{136.3g/mol}\\\\\text{Mass of zinc chloride}=(0.397mol\times 136.3g/mol)=54.1g$

Hence, the mass of zinc chloride produced in the reaction is 54.1 grams

7 0

3 years ago

You have 2.9 x 10^24 atoms of calcium How many grams do you have?

fomenos

Answer:

a mole of calcium is 6.02 ×10²³, therefore 2.9 ×10²⁴ will be ~4.82moles,

And since a mole of calcium is 40.1g

4.82 moles will be 4.82 × 40.1

that's =193.28g

6 0

3 years ago

A solution composed of 30.6g NH3 in 81.3g of H20. Calculate the mole fraction for NH3 and H20

irina [24]

Answer:

0.286 moles

Explanation:

i hope this is helpful for you

4 0

2 years ago

Read 2 more answers

Iron is found in Earth's crust as several iron compounds. Calculate the mass in kilograms of the amount of each of the following

myrzilka [38]

2074.74 kg is the mass of siderite in which 1x10^3 kg of iron is present.

Explanation:

Mass of iron is given as 1x10^3 Kg

mass of iron in siderite FeCO3 can be known

number of moles in 1x10^3 Kg iron is calculated by the formula.

number of moles = $\frac{mass}{atomic mass of one mole}$

atomic weight of iron is 55.84

number of moles = $\frac{1000.1000}{55.84}$

n= 17908.309 moles of iron in 1000 kg

1 mole of FeCO3 has 1 mole of Fe

x moles of FeCO3 will have $\frac{x}{17908.309}$ moles

$\frac{1}{1}$ = $\frac{x}{17908.309}$

x = 17908.309 moles of FeCO3 is there.

so mass can be calculated as number of moles x molar mass of one mole of the substance. (molar mass of siderite is 115.854 grams/mole)

17908.309 x 115.854

= 2074749.230 grams of siderite

(the molar mass is converted to kg/mole as the mass of iron is given by kg.

0.1158 kg is the molar mass of siderite)

2074749.230 grams of siderite is converted to kilogram

2074.74 kg is the mass of siderite in which 1x10^3 kg of iron is present.

4 0

4 years ago