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
Contact [7]
3 years ago
7

a sample of cesium metal reacted completely with water, evolving 48.1 ml of dry H2 at 19C and 768 mmHg. what is the equation for

the reaction? what was the mass of cesium in the sample ?
Chemistry
1 answer:
Amiraneli [1.4K]3 years ago
3 0
The reaction  for  equation is    written  as  follows

2Cs (s) +  2H2O(l) =  2CsOH (aq) +  H2  (g)

The  mass  of  cesium  is  calculated  as  follows

Find  the  moles  of  H2  by use  of  ideal  gas  equation  that is  Pv = nRT
where  n  is  the  number of   moles

 n  =  PV/RT
P=  48.1  ml    in  liters  =  48.1  /1000= 0.0481 l
T=  19 +  273.15 =  292.15K
P=  768mm hg
R (gas  Constant)=  62.364 l.
mmhg/k.mol

n= ( 768mmhg  x0.0481 L) /( 62.364 L.mm hg/k.mol  x  292.15k) =  2.028  x10^-3  moles

by   use  of  mole  ratio from  reacting  equation between  Cs to  H2    which  is   2 :1  the  moles  of Cs  is therefore  =  ( 2.028  x10^-3)  x  2 =  4.05  x10^-3 moles

mass  of  cs is therefore  =  moles  x  molar  mass  of  cs(  132.9g/mol)

=( 4.05  x10^-3)mol  x  132.9 g/mol  =  0.539  grams
You might be interested in
The acid-dissociation constant for benzoic acid (C6H5COOH) is 6.3×10−5. Calculate the equilibrium concentration of H3O+ in the s
raketka [301]

Answer : The equilibrium concentration of H_3O^+ in the solution is, 2.1\times 10^{-3}M

Explanation :

The dissociation of acid reaction is:

                       C_6H_5COOH+H_2O\rightarrow H_3O^++C_6H_5COO^-

Initial conc.        c                                 0                0

At eqm.             c-x                                 x                x

Given:

c = 7.0\times 10^{-2}M

K_a=6.3\times 10^{-5}

The expression of dissociation constant of acid is:

K_a=\frac{[H_3O^+][C_6H_5COO^-]}{[C_6H_5COOH]}

K_a=\frac{(x)\times (x)}{(c-x)}

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

6.3\times 10^{-5}=\frac{(x)\times (x)}{[(7.0\times 10^{-2})-x]}

x=2.1\times 10^{-3}M

Thus, the equilibrium concentration of H_3O^+ in the solution is, 2.1\times 10^{-3}M

4 0
3 years ago
BY ANSWERING THIS QUESTION UR PUTTING IT ON UR MOM's LIFE THAT U WON'T STEAL MY POINTS.
Yakvenalex [24]

Answer:

T_2=-125.58\°C

Explanation:

Hello!

In this case, considering the Gay-Lussac's law which describes the pressure-temperature behavior as a directly proportional relationship by holding the volume as constant, we write:

\frac{T_1}{P_1} =\frac{T_2}{P_2}

Whereas solving for the final temperature T2, we get:

T_2=\frac{T_1P_2}{P_1}

Thus, we plug in the given data (temperature in Kelvins) to obtain:

T_2=\frac{(22+273.15)K*1.75atm}{3.50atm} \\\\T_2=147.58K-273.15\\\\T_2=-125.58\°C

Best regards!

3 0
3 years ago
In stars, What atom is used with hygrogen atom in order to produce energy?
ch4aika [34]
In stars helium atoms are used with hydrogen atoms in order to produce energy.
Answer: A ) 
7 0
3 years ago
Chemistry is defined as:
attashe74 [19]

Answer:

Eeeeeeeeeeee

Explanation:

mark me as a brainlist

3 0
3 years ago
What functional group consists of a carbon atom double-bonded to an oxygen atom?
DaniilM [7]

Answer:

The answer to your question is: letter B.

Explanation:

Carbon atom double-bonded to an oxygen atom    C= O,

a) Carbohydrate group   this group does not exist

b)Carbonyl group  This option is right, carbonyl group is C=O

c) Hydroxyl group  This option is incorrect, hydroxyl group is OH, very different from C=O

d) Ketone group Ketone group does not exist, ketones have the same functional group as aldehydes (C=O)

7 0
3 years ago
Read 2 more answers
Other questions:
  • Which property is best to use when determining the strength of an ionic bond in a solid? lattice energy conductivity hardness so
    10·2 answers
  • Define and explain what an atom is
    5·1 answer
  • What is veces??????????????????????????????????
    7·1 answer
  • Which mineral test was used if a geologist refers to a mineral as metallic?
    11·2 answers
  • PLEASE HELP ME THIS IS DUE RN I HAVE NO IDEA I WILL MARK BRAINLIEST I JUST NEED HELP
    12·1 answer
  • Which of the following is an example of genetic engineering
    14·2 answers
  • Chemical bonds release energy when they break apart, and take in energy when they form. How does this observation help explain t
    8·2 answers
  • HELP!!! The chemical formula is different from the empirical formula in
    13·2 answers
  • What happens to temperature as objects are heated up and cooled down?
    6·1 answer
  • Which transfers thermal energy in the same way the Suns energy is transferred to Earth?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!