The gas phase decomposition of phosphine at 120 °C

PH3(g)1/4 P4(g) + 3/2 H2(g)

is first order in PH3 with a rate constant of 1.80×10-2 s-1.

If the initial concentration of PH3 is 8.48×10-2 M, the concentration of PH3 will be 2.45×10-2 M after
s have passed.

Answers

Answer 1

Answer:

The decreasing in concentration occurs after 69.0s

Explanation:

A first order reaction follows the equation:

Ln [A] = -kt + ln[A]₀

Where [A] is the concentration of the reactant after time t

k is rate constant of the reaction

And [A]₀ is the initial concentration of the reactant

Replacing:

Ln 2.45x10⁻²M = -1.80x10⁻²s⁻¹*t + ln8.48x10⁻²

-3.709 = -1.80x10⁻²s⁻¹*t -2.467

-1.2416 = -1.80x10⁻²s⁻¹*t

69.0s = t

The decreasing in concentration occurs after 69.0s


Related Questions

In the following reaction, in which direction, left or right, will the equilibrium shift if the following changes are made?

2NO (g) + H2 (g) ⇌ N2O (g) + H2O (g) + 36 kJ (heat)

N2 O (g) is added
Equilibrium shifts (LEFT / RIGHT)
H2 (g) is added
Equilibrium shifts (LEFT / RIGHT)

Answers

Answer:

Shifts to the left.

Shifts to the right.

Explanation:

Based on Le Châtelier's principle, when a change occurs in a system in equilibrium, the system will try to counteract the change that was made.

In the equilibrium:

2NO (g) + H₂ (g) ⇌ N₂O (g) + H₂O (g) + 36 kJ (heat)

If N₂O is added, the equilibrium shifts to the left trying to decrease the concentration of N₂O added.

If H₂ is added, the equilibrium shifts to the right trying to decrease the concentration of H₂ added

Look at the diagram below, which shows an atom of an element. How many valence electrons does it have? Based on this, would the atom be reactive or unreactive?

Answers

1. The number of valence electrons the atom have is seven (7).

2. The atom is reactive

1. How do i determine the number of valence electron in the atom?

Valence electron is simply defined as the number of electron(s) present in the outermost shell of an atom.

Considering the diagram given from the question, the number of electrons in the outermost shell is seven (7).

Thus, we can conclude that the valence electron the atom have is seven (7)

How do i know if the atom is reactive or not?

From the diagram given, we determine that the number of valence electrons present is 7. This means that the atom required 1 more electron to complete its octet configuration.

Thus, the atom will be very reactive in order to quickly attain a stable configuration.

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As the girl leaves her room, she flips the switch to turn off the light. Turning off the light make
A :a closed circuit
B :a series circuit
C :a parallel circuit
D :an open circuit

Answers

Answer:

A.

Explanation:

What is the tertiary consumer in this food chain?
A hawk
B lettuce
C snail
D thrush

Answers

Answer:

the hawk

Explanation:

in order it would be: producer, primary, secondary, tertiary

Answer:

the hawk is the tertiary consumer

A slug travels the length of a log in 2 hours. If the slug's average speed is 1.5 cm / minute how long is the log

Answers

Answer:

The length of the log is 180 cm

Explanation:

From the question given above, the following data were obtained:

Time = 2 hours

Speed = 1.5 cm/min

Distance =?

Next, we shall convert 2 hours to minutes. This can be obtained as follow:

1 h = 60 mins

Therefore,

2 h = 2 × 60

2 h = 120 mins

Finally, we shall determine the Lenght of the log. This can be obtained as follow:

Time = 120 mins

Speed = 1.5 cm/min

Distance =?

Speed = distance / time

15 = distance / 120

Cross multiply

Distance = 1.5 × 120

Distance = 180 cm

Therefore, the length of the log is 180 cm

Answer:

180

Explanation:

Where are the places these minerals are found: Gold, Limestone and kaiolin.

Answers

Explanation:

Gold: The Kolar Gold Fields in Kolar used to be one of the major producers of gold in India, before it shut down. Presently the gold mines of Hutti and Raichur produce almost 84 per cent of the country’s gold. The other major centers of gold mining are Dharwad and Chitradurga. The gold mines produce about 3,000 kg’s of gold per annum. The district of Raichur is also famous for its silver deposits.

Limestone: It is another important mineral with an estimated 51,000 million tons. Karnataka has the largest limestone reserve in India. The districts of Gulbarga, Bagalkot, Belgaum, Shimoga and other Uttara Kannada districts are endowed with extensive high grade limestone. The present and consistent production of approximately 14 million tonnes provides for the cement plants in these districts.

China clay (kaolin) consisting dominantly of kaolinite is one of the most sophisticated industrial minerals with a host of applications, viz., in ceramics, refractories, paper coating, filler for rubber, insecticides, cement, paint, textiles, fertilizers and others including abrasives, asbestos products, fibreglass, chemicals, cosmetics, pharmaceuticals, electrical ware, foundry and glass.

The Department of Mining and Geology through their past investigation campaigns in parts of Kerala,identified two major china clay zones viz., the southern china clay zone between Thiruvananthapuram and Kundara (Thiruvananthapuram and Kollam districts) and the northern china clay zone between Kannapuram Madayi -Cheruthazham in Kannur district to Nileswarm - Manjeshwaram in Kasargod district. An estimated reserve of 172 million tonnes (probable reserve of 80 million tonnes and possible reserve of 92 million tonnes) of china clay of sedimentary and residual origin has been arrived at.

Kerala china clay is one of the finest quality clay and is world class. In fact, Kaolin marketed by English Indian Clays Ltd. (EICL), Thiruvananthapuram claims to have similar or even better properties compared to imported clays.

Hope it's help you

Mark me as a brilliant

The net force of a vehicle that is accelerating at a rate of 1.5 m/s2 is 1,800 newtons. What is the mass of the vehicle to the nearest kilogram?

Answers

Answer:

1.2kg or 1200kg

Explanation:

F = ma

net force = 1,800

m = ??

a = 1.5m/s^2

m = F/a = 1,800/1.5 or 1,800 x 10/1.5 x 10

= 18,000/15 = 1,200kg or 1.2kg

Thanks

Name the gas that the limewater in the flask is testing for.

Answers

Answer:

Explanation:

Carbon dioxide is the answer I think.

Hope it helps...

Which is the conjugate acid of HSO4

Answers

Answer:

sulfuric acid

Explanation:

The conjugate acid of HSO4 -1 is H2 SO4. Adding one hydrogen ion to the hydrogen sulfate ion generates the conjugate acid. Its name is sulfuric acid.

Which of the following are solutions?
Choose more than one if needed

1. Gas dissolved in a liquid

2. Liquid dissolved in a liquid

3. Solid mixed with solid

4. Solid dissolved in a liquid

Answers

Answer:

3

Explanation:

Sn(IV) and Br
chemical formula

Answers

the chemical is SnBr4 I’m pretty sure

How are plate tectonics and the rock cycle connected? Select the best answer from the choices below.

a
The rock cycle keeps the plates from moving too far apart
b
Igneous rocks that form from magma are a major part of the rock cycle
c
The heat from the mantle that fuels plate tectonics also drives the rock cycle
d
Plate tectonics causes sedimentary rocks to turn into metamorphic rocks

Answers

the correct answer is the option c

How many moles of F2 are required to produced 8.3 moles of HF

Answers

The answers?? Are Whichhhh

calculate the number of atoms in 112 g of iron.​

Answers

Answer:

1 mole of iron (Fe) = 56 g (molar mass)

Since 56 g of iron = 1 mol.

Therefore, 112 g of iron= 1/ 56 ×112 mol = 2 mol.

Explanation:

How can water affect the rock cycle?

Water can cause rocks to break into sediments through mechanical weathering.
Water can cause rocks to be buried deep underground.
Water can cause rocks to melt.
Water can causer rocks to break into sediments through chemical weathering.

Answers

Answer:

b

Explanation:

b because it's a physical change

What is a reducing agent?​

Answers

Answer: Its an element or compound that loses (or "donates") an electron to an electron recipient (oxidizing agent) in a redox chemical reaction.

CREDIT: Wikipedia

Answer:A reducing agent typically is in one of its lower possible oxidation states and is known as the electron donor.

Example: Examples of reducing agents include the earth metals, formic acid, oxalic acid, and sulfite compounds.

Which reaction would cause an increase in entropy?

Answers

to be honest it have to be c because it shows things

Answer:

The other guy is completely wrong.

The answer is B.SO2CI2 (g) > SO2 (g)+CI2(g)

Explanation:

A P E X

1. Cierta muestra fue diluida así: 1 mL MP se agrega 4mL de agua, luego se extrae 0,5 mL y se lleva a 5 mL y de esta última se obtiene 0,2 y se añade 1,3 de diluyente. Calcule la dilución total.

Answers

Answer:

1/375

Explanation:

Primero se debe calcular el factor de dilución para cada dilución seriada. Para ello, se divide el volumen de muestra entre el volumen final de la solución diluida.

1) 1 mL  en 1 mL + 4 mL = 5 mL

D1 = 1 mL/5 mL = 1/5

2) 0,5 mL en 5 mL

D2 = 0,5 mL/5 mL = 1/10

3) 0,2 mL en 0,2 mL + 1,3 mL = 1,5 mL

D3 = 0,2 mL/1,5 mL = 2/15

La dilución total se calcula como el producto de las diluciones seriadas realizadas:

DT = D1 x D2 x D3 = 1/5 x 1/10 x 2/15 = 1/375

Convert 812.4 kPa into atm

Answers

Answer:

Explanation:

There are a series of unit used to measure PRESSURE. They include millimetre mercury (mmHg), atmospheric pressure (atm), kilopascal etc. These units of measurement are interconvertible i.e. can be changed from one unit to another.

Based on this question asking to convert

1 kilopascal = 0.00986923atm

Plants have various levels of organization. At which level of organization are the smallest structures in a plant?

Cellular
Organ
Organism
Tissue

Answers

Organ is the answer not the cellar

Can you use carbon dioxide in the dark

Answers

Answer:

If you already have a solenoid, there is nothing wrong with running CO2 with the lights only. It will save CO2, and prevent excessive CO2 levels at night. Some think the CO2 should be up to max levels when the lights go on.

Explanation:

Which of the following is NOT a benefit of
using renewable energy sources?

Answers

Answer:

D, They produce fossil fuels

Explanation:

you can't just pull them out of nowhere

The answer would be considered D.

What change in volume results if 75.0 mL of gas is cooled from 100.0 °C
to 0.00 °C

Answers

Answer:

Final volume v2 = 0 ml

Explanation:

Given:

Initial temperature = 100°C

Initial volume = 75 ml

Final temperature = 0°C

Find:

Final volume

Computation:

Using Charles law formula;

⇒ V1 / T1 = V2 / T2

Where

⇒ Initial temperature = T1

⇒ Initial volume = V1

⇒ Final temperature = T2

⇒ Final volume = V2

So,

⇒ 75 / 100 = V2 / 0

Final volume v2 = 0 ml

How do we designate recessive
genes?
A. They are male.
B. They are lower case letters.
C. They are female.
D. They are capital letters.

Answers

The answer to your question is B. They are lower case letters...

The pH of a solution can be determined by using a

A. Filter paper

B. Potentiometer

C. Thermometer

D. pH paper

real answers plz not bots

Answers

B is the right answer

Calculate the given mass in 0.5 mol. Of CH4 

Answers

Answer:

8 grams

Explanation:

The molar mass of CH4 is about 16 grams per mol.  So you get the answer by mutlitplying 0.5 by 16, (cancel out moles by placing 1 on the bottom of the fraction).

Answer:

8 (g)

Explanation:

[tex]m= n * M[/tex]

m= 0.5*(12+1*4)=0.5*16 =8 (g)

A gas has a volume of 10.0 L at 20 degree Celsius. At what temperature does the gas have a volume of 20.0 L ?

Answers

Answer:

286 K

Explanation:

From the question,

Applying Charles law,

V/T = V'/T'.................... Equation 1

Where V = Initial Volume of gas, T = Initial Temperature of gas in Kelvin, V' = Final Volume of gas, T' = Final Temperature of gas in Kelvin

Make T' the subject of the equation

T' = V'T/V.................. Equation 2

Given: V = 10.0 L, V' = 20.0 L, T = 20°C  = (20+273) = 293 K.

Substitute these values into equation 2

T' = (20×293)/10

T' = 586 K

Hence the temperature of the gas is 586 K

Fluorine gas a 300 K occupies a volume of 500 mL. To what temperature should it be lowered to bring the volume to 300 mL?

Answers

180 K

V1/T1 = V2/T2
V1 = 500 mL
T1 = 300 K
V2 = 300 mL

Solve the equation for T2 —> T2 = V2T1/V1

T2 = (300 mL)(300 K) / (500 mL) = 180 K

The temperature should be lowered to 300K to bring the volume to 300mL.

What is temperature?

Temperature is the degree of hotness or coldness of a place or a body. The SI unit of temperature is Kelvin.

What is volume?

Volume is the amount of space occupied by matter. The SI unit of volume is cubic metre.

Using Charles law,

V1/V2 = T1/T2

Where, V1 and T1 are the initial volume and temperature

Similarly, V₂ and T₂ are the final volume and temperature.

Given:

V1 = 500mL

T1 = 300K

V2 = 300mL

T2 = ?

V1T2/V1 = V2T1/V1

          T2 = V2T1/V1

                = 300mL x 300K/500mL

           T2 = 180K

Hence, the temperature should be lowered to 300K to bring the volume to 300mL.

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What happens with electrons when atoms form covalent bonds?

Answers

Answer:

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.

Explanation:

Write word equation of sodium reacts with chlorine to get sodium chloride

Answers

Answer:

Na+ + Cl-=NaCl

Explanation:

Sodium have +ions while Chlorine have - ions the ions will cancel and it will equal to NaCl

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