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
Kryger [21]
3 years ago
14

The phase change between white tin and gray tin is difficult to observe directly. Both substances can be burned, however. From t

hese equations, calculate AHⓇ for the conversion of gray tin into white tin:
Sn(s, white) + O2(g) + SnO2(g) AH = -580.69 kJ
Sn(s, gray) + O2(g) + SnO2(g) AH° = -582.78 kJ
AH = _________ kJ
Chemistry
1 answer:
AleksandrR [38]3 years ago
8 0

Answer: Thus \Delta H for the conversion of gray tin to white tin is -20.9 kJ

Explanation:

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The final reaction is

Sn(s, gray)\rightarrow Sn(s, white)  \Delta H=?

The intermediate balanced chemical reaction will be,

Sn(s, gray)+O_2(g)\rightarrow SnO_2(g)  \Delta H^0=-582.78kJ    (1)

Sn(s, white)+O_2(g)\rightarrow SnO_2(g)  \Delta H^0=-580.69kJ     (2)    

substarcting (2) form (1) we get

\Delta H=\Delta H_1-\Delta H_2

\Delta H=-582.78-(-580.69kJ)

\Delta H=-20.9kJ

You might be interested in
HELP QUICK ILL GIVE YOU BRAINLIEST AND 25 POINTS! bromine (br) has four energy levels. name 2 other elements that would have fou
Temka [501]

Answer:

titanium and potassium

Explanation:

6 0
3 years ago
Read 2 more answers
Which answer choice best describes the difference between folded mountains and fault-block mountains?
melamori03 [73]

The answer is; C

In folding, when segments of Earth's crust are bent and doubled over, the sediments in between are form folds, since they are forced into a smaller space.  This also occurs in converging plates boundaries.

Block Mountains occur when stress due to compression in the crust causes the hanging wall between a fault to move up relative to the footwall.


6 0
3 years ago
Read 2 more answers
Plz help :( plz help me understand :(
Darina [25.2K]

Answer:

DONT PRESS THAT THAT IS HACK AND VIRUS

Explanation:

3 0
3 years ago
Aluminum metal and manganese (IV) oxide react to produce aluminum oxide and manganese metal. What mass of manganese (IV) oxide r
gayaneshka [121]

Answer: 1.77 kg of manganese (IV) oxide reacts to produce 1.12kg of manganese metal.

Explanation:

The balanced chemical equation is:

4Al+3MnO_2\rightarrow 2Al_2O_3+3Mn

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}

moles of manganese = \frac{1.12\times 1000g}{55g/mol}=20.4mol

According to stoichiometry :

3 moles of Mn is produced by = 3 moles of MnO_2

Thus 20.4 moles of Mn is produced by =\frac{3}{3}\times 20.4=20.4moles  of MnO_2

Mass of MnO_2=moles\times {\text {Molar mass}}=20.4moles\times 86.9g/mol=1773g=1.773kg    (1kg=1000g)

Thus 1.77 kg of manganese (IV) oxide reacts to produce 1.12kg of manganese metal.

6 0
3 years ago
How many grams of nh3 can be produced from 3.72 mol of n2 and excess h2.
olganol [36]
N₂       + 3H₂ ⇒ 2NH₃
1mol       :         2mol
3,72mol  :         7,44mol

n = 7,44mol
M = 17g/mol

m = n * M = 7,44mol * 17g/mol = 126,48g
7 0
3 years ago
Other questions:
  • A gas occupies a volume of 750 mL at 101.3 kPa. What pressure (in kPa) is needed to decrease the volume to 250mL?
    7·1 answer
  • 20 points!!!!!!!!!!!!!!! And I will mark as brainliest!!!!
    6·1 answer
  • Which type of science includes the study of plans
    6·2 answers
  • I need help on this!!
    6·1 answer
  • Consider the following reaction at 298K.
    7·1 answer
  • Why are many fossil remains left from the last ice age
    9·1 answer
  • Which of the following is not a factor that affects thermal energy of a substance?
    13·1 answer
  • Help! What is the the correct number for the product of this particular reaction?
    7·1 answer
  • Which two things cause the orbits of the planets to be the nearby circular
    14·1 answer
  • What is a balanced nuclear equation for the alpha decay of Strontium-90?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!