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2 years ago

To find the number of neutrons in To find the number of neutrons in and you would subtract

Chemistry

1 answer:

givi [52]2 years ago

6 0

Answer:

To find the number of neutrons we would subtract the number of protons from mass number of an atom.

Explanation:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

For example:

The mass number of carbon is 12 amu and it has six protons thus to find the number of neutrons we would subtract the 6 from 12 and get number of neutrons.

12- 6 = 6 neutrons

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Dinitrogen pentoxide decomposes in the gas phase to form nitrogen dioxide and oxygen gas. The reaction is first order in dinitro

vitfil [10]

Answer : The partial pressure of $O_2$ is, 222.93 torr

Explanation :

Half-life = 2.81 hr = 168.6 min

First we have to calculate the rate constant, we use the formula :

$k=\frac{0.693}{t_{1/2}}$

$k=\frac{0.693}{168.6min}$

$k=4.11\times 10^{-3}min^{-1}$

Now we have to calculate the partial pressure of $O_2$

The balanced chemical reaction is:

$2N_2O_5(g)\rightarrow 4NO_2(g)+O_2(g)$

Initial pressure 760 0 0

At eqm. (760-2x) 4x x

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{P_o}{P_t}$

where,

k = rate constant

t = time passed by the sample = 215 min

a = initial pressure of $N_2O_5$ = 760 torr

a - x = pressure of $N_2O_5$ at equilibrium = (760-2x) torr

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

$215=\frac{2.303}{4.11\times 10^{-3}}\log\frac{760}{760-2x}$

$x=222.93torr$

The partial pressure of $O_2$ = x = 222.93 torr

7 0

3 years ago

Given that:2NO (g)→N2 (g)+O2 (g)N2 (g)+O2 (g)+Cl2 (g)→2NOCl (g) has an enthalpy change of −180.6 kJ has an enthalpy change of 10

likoan [24]

Answer:

Explanation:

It is possible to answer this question knowing Hess's law that says you can sum half-reactions enthalpy cahnge to obtain enthalpy change of the total reaction. Using the reactions:

(1) 2NO(g) → N₂(g)+O₂(g) ΔH = -180,6 kJ

(2) N₂(g) + O₂(g) + Cl₂(g) → 2NOCl(g) ΔH = +103,4 kJ

The reverse reactions of (1) and (2) are:

N₂(g)+O₂(g) → 2NO(g) ΔH = +180,6 kJ

2NOCl(g) → N₂(g) + O₂(g) + Cl₂(g) ΔH = -103,4 kJ

The sum of these reactions is:

2NOCl(g) → 2NO(g) + Cl₂(g) ΔH = +180,6 kJ -103,4 kJ = 77,2 kJ

I hope it helps!

6 0

2 years ago

HELP ASP

Kipish [7]

True becuase the substance changed into another substance which is a example of a chemical reaction.

3 0

2 years ago

An experiment requires that each student use an 8.5 cm length of magnesium ribbon. How many students can do the experiment if th

melisa1 [442]

570/8.5=67.0 58... you only have to take the natural part, si the answer is 67 students

7 0

3 years ago

Read 2 more answers

A solution of HNO3 has a [H+] concentration of 0.001 M. What is the pH of point

Citrus2011 [14]

Answer:

Explanation:

pH=-log(H+)

- Hope that helps! Please let me know if you need further explanation.

7 0

3 years ago