Which reacts faster, rock salt or grains of salt? Why?

Given the lattice energy of NaCl = 787 kJ/mol, the ionization energy of Na = 496 kJ/mol and the electron affinity of Cl = −349 k

guajiro [1.7K]

Answer : The value of $\Delta H_f^o$ for the reaction is, -640 KJ/mole

Explanation :

The steps involved in the formation of $NaCl$ :

(1) Conversion of gaseous sodium atoms into gaseous sodium ions.

$Na(g)\overset{\Delta H_I}\rightarrow Na^{+1}(g)$

$\Delta H_I$ = ionization energy of sodium = 496 kJ/mol

(2) Conversion of gaseous chlorine atoms into gaseous chlorine ions.

$Cl(g)\overset{\Delta H_E}\rightarrow Cl^-(g)$

$\Delta H_E$ = electron affinity energy of chlorine = -349 kJ/mol

(3) Conversion of gaseous cations and gaseous anion into solid sodium chloride.

$Na^{1+}(g)+Cl^-(g)\overset{\Delta H_L}\rightarrow NaCl(s)$

$\Delta H_L$ = lattice energy of sodium chloride (always negative) = -787 kJ/mol

To calculate the overall energy the equation used will be:

$\Delta H_f^o=\Delta H_I+\Delta H_E+\Delta H_L$

Now put all the given values in this equation, we get:

$\Delta H_f^o=496KJ/mole+(-349KJ/mole)+(-787KJ/mole)$

$\Delta H_f^o=-640KJ/mole$

Therefore, the value of $\Delta H_f^o$ for the reaction is, -640 KJ/mole

6 0

3 years ago

A parachutist’s speed during a free fall reaches 55 meters per second. What is the speed in feet per second? At this speed, how

Iteru [2.4K]

Answer:

1650 feet

Explanation:

You multiply 55 times 3.3 and get an answer of 165. This mean that the person is falling 165 feet every second. Multiply 165 times 10 and get 1650 feet in ten seconds.

4 0

3 years ago

Which of the following are descriptive of the neutral atom with the electron configuration of 1s22s22p3?

Wittaler [7]

- It is in its ground state.

- It is an atom of Nitrogen.

- It has 3 electrons in its highest energy sublevel.

6 0

3 years ago

Read 2 more answers

A sample of N2(g) was collected over water at 25 oC and 730 torr in a container with a volume of 340 mL. The vapor pressure of w

harina [27]

Answer:

0.36 g of N2.

Explanation:

The following data were obtained from the question:

Temperature (T) = 25 °C

Volume (V) = 340 mL

Measured pressure = 730 torr

Vapour pressure = 23.76 torr

Mass of N2 =..?

First, we shall determine the true pressure of N2. This can be obtained as follow:

Measured pressure = 730 torr

Vapor pressure = 23.76 torr

True pressure =..?

True pressure = measured pressure – vapor pressure

True pressure = 730 – 23.76

True pressure = 706.24 torr.

Converting 706.24 torr to atm, we have:

760 torr = 1 atm

Therefore,

706.24 torr = 706.24 / 760 = 0.929 atm

Next, we shall convert 340 mL to L. This is illustrated below:

1000 mL = 1 L

Therefore,

340 mL = 340/1000 = 0.34 L

Next, we shall convert 25 °C to Kelvin temperature. This is illustrated below:

Temperature (K) = Temperature (°C) + 273

T(K) = T (°C) + 273

T (°C) = 25 °C

T(K) = 25 °C + 273

T (K) = 298 K

Next, we shall determine the number of mole of N2. This can be obtained as follow:

Pressure (P) = 0.929 atm

Volume (V) = 0.34 L

Temperature (T) = 298 K

Gas constant (R) = 0.0821 atm.L/Kmol

Number of mole (n) =...?

PV = nRT

0.929 x 0.34 = n x 0.0821 x 298

Divide both side by 0.0821 x 298

n = (0.929 x 0.34 ) /(0.0821 x 298)

n = 0.0129 mole

Finally, we shall determine the mass of N2 as shown below:

Mole of N2 = 0.0129 mole

Molar mass of N2 = 2x14 = 28 g/mol

Mass of N2 =.?

Mole = mass /Molar mass

0.0129 = mass of N2/ 28

Cross multiply

Mass of N2 = 0.0129 x 28

Mass of N2 = 0.36 g

Therefore, 0.36 g of N2 was collected.

8 0

4 years ago

Fill in the blanks

REY [17]

Answer:

created nor destroyed.

5 0

3 years ago

Which reacts faster, rock salt or grains of salt? Why?​

Which reacts faster, rock salt or grains of salt? Why?