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
solong [7]
3 years ago
10

A 0.250 gram chunk of sodium metal is cautiously dropped into a mixture of 50.0 grams of water and 50.0 grams of ice, both at 0

degress celsius. The reaction is:2Na(s)+2H2O(l) yields 2NaOH(aq)+H2(g) Change in H is -368 KJWill the ice melt?
Assuming the final mixture has a specific heat capacity of 4.18 J/g*degrees celsius, calculate the final temperature. The enthalpy of fusion for ice is 6.02 KJ/mol.
Chemistry
1 answer:
JulsSmile [24]3 years ago
5 0

Answer:

The ice will not melt, and the temperature will remain at 0°C.

Explanation:

The reaction of the sodium in water is exothermic because heat is being released. In an isolated system, the change in heat must be 0, so the released heat must be absorbed by the ice.

The molar mass of Na is 23 g/mol, so the number of moles that reacted was:

n = 0.250 g/ 23g/mol

n = 0.011 mol

By the reaction:

2 moles ------- -368 kJ

0.011 mol ----- x

By a simple direct three rule:

2x = -4.048

x = -2.024 kJ/mol

So the ice will absorbs 2.024 kJ/mol, which is less than the necessary to melt it (6.02 kJ/mol). Then, the ice will not melt.

The temperature of a pure substance didn't change until all of it has changed of phase, so the temperature must remain at 0°C.

You might be interested in
Im literally failing some classes can some one help me with them
galben [10]

Answer:in can

Explanation:

5 0
3 years ago
Read 2 more answers
How many grams are in 0.535 moles of sodium bromide? (Please add work)
anastassius [24]

Answer:

0.535 = 55.04816695 grams

Explanation:

0.009718761398284852 moles = 1 gram

3 0
3 years ago
Cliffs may be affected by weathering. Describe ONE  effect of weathering on a cliff .
Anni [7]
Well if too much weathering occurs, it might break off parts of the cliff and be dangerous to humans, or animals. 
4 0
3 years ago
Read 2 more answers
What is true of intercellular signals that do not go through direct connections between cells, such as plasmodesmata?
Ronch [10]

I believe that what happens here is that when those cells carrying those intercellular signals do no pass through the connections, actually the signal is passed through or are transferred to adjacent cells for signal transmission, hence the answer is:

<span>B</span>

6 0
3 years ago
Read 2 more answers
Name the cycloalkanes with molecular formula c6h12 that have a 3-membered ring and two substituents.
Tanzania [10]

Answer:

1-ethyl-2-methyl cyclopropane.

Explanation:

  • The structure of the molecule will be as shown in the attached image.
  • The molecular formula of the compound is C₆H₁₂.
  • It has 3 membered ring with 3 C atoms and two substituents one of them with one C atom (methyl) and the other with 2 C atoms (ethyl).
  • The ring consist of 3 C atoms, so its name is cyclo propane.
  • We numbering the atoms of the ring that give the ethyl substituent the low no. (1) and then methyl group take no. (2).
  • <em>Thus, the name of the compound is 1-ethyl-2-methyl cyclopropane.</em>

3 0
3 years ago
Other questions:
  • Methylhydrazine, CH6N2, is commonly used as a liquid rocket fuel. The heat of combustion of methylhydrazine is −1.30 × 103 kJ/mo
    9·1 answer
  • How many moles of nitrogen gas are there in 6.8 liters at room temperature and pressure (293 K and 100 kPa)?
    7·1 answer
  • g How many grams of beryllium are needed to produce "11.5" g of hydrogen gas?Be(s) + 2H 2 O(l) → Be(OH) 2 (aq) + H 2 (g)
    5·1 answer
  • Which statement is true for a cooling curve​
    6·1 answer
  • Create a graph of y=2x−6.<br> Construct a graph corresponding to the linear equation y=2x−6.
    15·1 answer
  • Question 4 of 20
    11·1 answer
  • Calculate the number of moles of sulfuric acid in 0.49 g of sulfuric acid, H2SO4
    6·1 answer
  • Our _____________ is affected by physical environment.
    5·2 answers
  • What is the first element in the periodic table?
    12·2 answers
  • Pls help with these two questions~-~
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!