1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
zubka84 [21]
3 years ago
14

PLEASE NEED HELP QUICK DEADLINE SOON

Chemistry
1 answer:
Nadya [2.5K]3 years ago
6 0

Answer:

D. Protons ; neutrons.

Explanation:

For a given element the number of protons is fixed, but the number of neutrons differ because the element usually consist of a number of isotopes.

For example Carbon has isotopes which contain 12, 13 and 14 neutrons.

So that is why you average the number of neutrons to find the approximate atomic mass..

You might be interested in
Which property of a wave do you think changes the most as the wave approaches the shore?
solniwko [45]
The speed and wavelength changes as a waves travels to a different depth. Slower and bigger amplitudes in shallower depths. Freq does not change
6 0
3 years ago
Two scientists were competing to earn some grant money to fund their research, because
Citrus2011 [14]
Societal and economical
3 0
3 years ago
Read 2 more answers
Calculate the theoretical yield of ammonia produced by the reaction of 100 g of H2 gas and 200g of N2 gas? 3H2(g) + N2(g)-----&g
Alex787 [66]
Moles of Hydrogen present: 100 / 2 = 50 moles

Moles of Nitrogen present: 200 / 28 = 7.14 moles

Hydrogen required by given amount of nitrogen = 7.14 x 3 = 21.42 moles

Hydrogen is excess so we will calculate the Ammonia produced using Nitrogen.

Molar ratio of Nitrogen : Ammonia = 1 : 2

Moles of ammonia = 7.14 x 2 = 14.28 moles
8 0
3 years ago
Read 2 more answers
H-C C-H name of formula
Vanyuwa [196]

Answer:

Ethyne

Explanation:

7 0
3 years ago
In the gas-phase reaction 2 A + B ⇌ 3 C + 2 D, it was found that, when 1.00 mol A, 2.00 mol B, and 1.00 mol D were mixed and all
Naddik [55]

Answer:

(i)The mole fractions are :

  • A=\frac{0.4}{4.3} \\=0.0930
  • B=\frac{1.4}{4.3} \\=0.3256
  • C=\frac{0.9}{4.3} \\=0.2093
  • D=\frac{1.6}{4.3} \\=0.3721

(ii)K=0.4508

(iii)ΔG = 1.974kJ

Explanation:

The given equation is :

2A+B⇄3C+2D

Let \alpha be the number of moles dissociated per mole of B

Thus ,

<em>The initial number of moles of :</em>

  • A=1
  • B=2
  • C=0
  • D=1

2A\\(1-2\alpha)     +  B\\2(1-\alpha)  ⇄  3C\\(3\alpha)   + 2D\\(1+2\alpha)

And finally the number of moles of C[tex] is 0.9Thus ,[tex]3\alpha=0.9\\\alpha=0.3[tex]The final number of moles of:[tex]A = 1-2\alpha=1-2*0.3=0.4mol[tex] [tex]B=2(1-\alpha)=2(1-0.3)=1.4mol[tex][tex]D=1+2\alpha=1+2*0.3=1.6mol[tex]Thus , total number of moles are : 0.4+1.4+0.9+1.6=4.3(i)The mole fractions are : [tex]A=\frac{0.4}{4.3} \\=0.0930

  • B=\frac{1.4}{4.3} \\=0.3256
  • C=\frac{0.9}{4.3} \\=0.2093
  • D=\frac{1.6}{4.3} \\=0.3721

(ii)

K=\frac{(P_C^3)(P_D^2)}{(P_A^2)(P_B)}

Where ,

P_A,P_B,P_C,P_D are the partial pressures of A,B,C,D respectively.

Total pressure = 1 bar .

∴

<em>P_A= 0.0930*1=0.0930</em>

<em>P_B= 0.3256*1=0.3256</em>

<em>P_C= 0.2093*1=0.2093</em>

<em>P_D= 0.3721*1=0.3721</em>

K=\frac{0.2093^3*0.3721^2}{0.0930^2*0.3256} \\K=0.4508

(iii)

ΔG=-RTlnK\\

ΔG = -8.314*(273+25)*ln(0.4508)\\=1973.96J\\=1.974kJ

3 0
3 years ago
Other questions:
  • Which of the following is not an organic compound?<br> Corn oil<br> Bromine<br> Methane<br> Protein
    6·1 answer
  • What cultural differences does Herodotus notice between Greek ways of living and those of Persia and Egypt
    10·1 answer
  • Which of the following compounds is not ionic?
    9·1 answer
  • Methanol, CH3OH, formerly known as wood alcohol, is manufactured commercially by the following reaction A 1.500-L vessel was fil
    8·1 answer
  • I don’t know how to do this
    13·1 answer
  • A 425-ml sample of hydrogen is collected above water at 35°c and 763 torr. find the volume of the hydrogen sample when the tempe
    5·2 answers
  • When the concentration of A in the reaction A ..... B was changed from 1.20 M to 0.60 M, the half-life increased from 2.0 min to
    11·1 answer
  • B. What do you notice about the number of atoms in one mole?
    15·1 answer
  • Methane undergoes combustion. Which products form?
    10·1 answer
  • Adding heat and increasing concentration are meant to cause an increase in....?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!