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
tangare [24]
2 years ago
7

When radioactive thorium (Th) decays it emits a beta particle and produces protactinium (Pa) as seen in the nuclear equation. Th

e atomic mass of thorium missing in the nuclear equation must be A) 233. B) 234. C) 235. D) 238.
Chemistry
1 answer:
Rudik [331]2 years ago
6 0

Answer:

B

Explanation:

234 i did this on usatestprep

You might be interested in
A solution contains 0.115 mol h2o and an unknown number of moles of nacl. the vapor pressure of the solution at 30°c is 25.7 tor
Valentin [98]
According to Raoult's low:
We will use this formula: Vp(Solution) = mole fraction of solvent * Vp(solvent)
∴ mole fraction of solvent = Vp(Solu) / Vp (Solv)
when we have Vp(solu) = 25.7 torr & Vp(solv) = 31.8 torr 
So by substitution:
∴ mole fraction of solvent = 25.7 / 31.8 =0.808 
when we assume the moles of solute NaCl = X 
and according to the mole fraction of solvent formula:
mole fraction of solvent = moles of solvent / (moles of solvent + moles of solute)
by substitute:
∴ 0.808 = 0.115 / (0.115 + X)
 So X (the no.of moles of NaCl) = 0.027 m
8 0
3 years ago
The H+ ion concentration of a solution is 1 x 10 ^ -5 M. This solution is...
pav-90 [236]

Answer:

To know this

get the pH

pH= -log(H+)

pH= -log(1x10^-5)

pH= 5.

It is Acidic.

Acidic ranges from 1 - 7

It falls within this range

3 0
3 years ago
What is the percent by volume of 25mL ethanol in 150 mL of water
Virty [35]
The answer would be .166
6 0
3 years ago
II<br> 5. C2H6<br> In Lewis dot structure
Nonamiya [84]
H H
I I
H - C - C - H
l l
H H

A Carbon can only form 4 bonds and a Hydrogen can only form 1 bond.
8 0
3 years ago
The value of Ka for phenol (a weak acid), C6H5OH, is 1.00×10-10. Write the equation for the reaction that goes with this equilib
I am Lyosha [343]

Answer:

Ka=\frac{[C_6H_5O^-][H^+]}{[C_6H_5OH]}

Explanation:

Hello,

In this case, weak acids are characterized by the fact they do not dissociate completely, it means they do not divide into the conjugated base and acid at all, a percent only, which is quantified via equilibrium. In such a way, the chemical equation representing such incomplete dissociation is said to be:

C_6H_5OH\rightleftharpoons C_6H_5O^-+H^+

Thus, we can write the law of mass action, which consider the equilibrium concentrations of all the involved species, which is also known as the acid dissociation constant which accounts for the capacity the acid has to yield hydronium ions:

K=Ka=\frac{[C_6H_5O^-][H^+]}{[C_6H_5OH]}

Best regards.

3 0
3 years ago
Other questions:
  • Which scientist was responsible for discovering the neutron? A. Niels Bohr B. Robert Millikan C. James Chadwick D. Ernest Ruther
    8·2 answers
  • **PLATO QUESTION, PLEASE ANSWER CORRECTLY, THANKS SO MUCH**
    9·2 answers
  • If the molar mass of NaCl is 58.44 g/mol, what amount of NaCl (in mol) is contained in 250.0 mg of NaCl?
    11·1 answer
  • 1. Why Are biomolecules essential for life?
    9·1 answer
  • aqueous solution containing 17.5 g of an unknown nonelectrolyte compound in 100. gof water has a freezing point of –1.8 oC. Calc
    14·2 answers
  • Hydrogen sulfide,H2S, is a very toxic gas with a smell of rotten eggs. using the following: H2S+3/2 O2=SO2+H2O H2+1/2O2=H2O S+O2
    8·1 answer
  • How do you write the balanced equation ​
    14·1 answer
  • If 143.56 mL of 0.6653 M ammonium carbonate reacts with 175.37 mL of 0.8732 M chromium(III) sulfate in a double replacement reac
    8·2 answers
  • AWNSER FAST PLEASE
    6·1 answer
  • 13. Describe briefly how you figured out what the name of the element is:
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!