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
WINSTONCH [101]
3 years ago
8

Calculate the heat change in calories for melting 65 g of ice at 0 ∘c.

Chemistry
1 answer:
Genrish500 [490]3 years ago
5 0

When ice melts, the physicals state changes from solid to liquid. The energy or the heat required (q) required to change a unit mass (m) of a substance from solid to liquid is known as the enthalpy or heat of fusion (ΔHf). The variables; q, m and ΔHf are related as:

q = m * ΔHf

the mass of ice m = 65 g

the heat of fusion of water at 0C = ΔHf = 334 J/g

Therefore: q = 65 g * 334 J/g = 21710 J

Now:

4.184 J = 1 cal

which implies that: 21710 J = 1 cal * 21710 J/4.184 J = 5188.8 cal

Hence the heat required is 5188.8 cal or 5.2 Kcal (approx)

You might be interested in
Silver chloride is formed by mixing silver nitrate and barium chloride solutions. What volume of 1.50 M barium chloride solution
konstantin123 [22]

Answer:

1.22 mL

Explanation:

Let's consider the following balanced reaction.

2 AgNO₃ + BaCl₂ ⇄ Ba(NO₃)₂ + 2 AgCl

The molar mass of silver chloride is 143.32 g/mol. The moles corresponding to 0.525 g are:

0.525 g × (1 mol/143.32 g) = 3.66 × 10⁻³ mol

The molar ratio of AgCl to BaCl₂ is 2:1. The moles  of BaCl₂ are 1/2 × 3.66 × 10⁻³ mol = 1.83 × 10⁻³ mol.

The volume of 1.50 M barium chloride containing 1.83 × 10⁻³ moles is:

1.83 × 10⁻³ mol × (1 L/1.50 mol) = 1.22 × 10⁻³ L = 1.22 mL

8 0
3 years ago
ASAP PLSS!!! Does evaporation stops once the vapor pressure reaches a certain point?
denis-greek [22]

Answer: Once the vapor pressure of the system reaches a specific level, the rate of evaporation will slow down

Explanation: I really hope this helps :) - XxJaynaJxX

6 0
3 years ago
Why does the sky appear orang or red at sunset and sunrise?
LUCKY_DIMON [66]

Answer:

Because the sun is low on the horizon, sunlight passes through more air at sunset and sunrise than during the day, when the sun is higher in the sky. More atmosphere means more molecules to scatter the violet and blue light away from your eyes.

3 0
3 years ago
1. How many moles of carbon are in 2.25 * 10^22 atoms of carbon ?
tresset_1 [31]

Answer:

atoms of C? 2.25 x 1022 atoms C x 1 mole C = 0.037 mol C

Explanation:

 How many moles of C are in 2.25 x 1022 atoms of C?

3 0
2 years ago
Which element has an outer(ending) electron configuration of s2p4?
goblinko [34]

The question is in complete, the complete question is:

Which element has an outer electron configuration of s 2 p4 ?

(A) Ca (B) Cr (C) Ge (D) Se

Answer:

(D) Se

Explanation:

The outer electronic configuration of an atom reflects the group to which it belongs in the periodic table. Each group has its unique outermost electron configuration and number of electrons found in the outermost shell of the atoms of elements in the group.

s 2 p4  is the unique outermost electron configuration of group 16 elements. Group 16 elements have six electrons in their outermost shell. If we consider the options, only Se is a member of group 16. Hence it is only Se that has the outermost electron configuration s 2 p4 .

5 0
3 years ago
Other questions:
  • 1)
    10·1 answer
  • An empty fuel tank can still contain ________ and therefore can be even more dangerous than one full of liquid fuel.
    7·2 answers
  • If the temperature changes in a chemical reaction, what has occurred?
    7·1 answer
  • What is the function of stomata in plants?
    9·1 answer
  • Determine the mass of 10.55 x 1029 molecules of cadmium chloride, CdCl,().
    12·1 answer
  • Use this information to determine the number of valence electrons in the atoms. Which of the following correctly compares the st
    12·1 answer
  • An average bushel of apples has a mass of 10 kg and contains 5 dozen apples.
    11·1 answer
  • 15. Mass = 25g<br> Start: 45mL<br> Final: 50mL<br> • What is the Volume?<br> • What is the Density?
    13·1 answer
  • When a boron atom loses its valence electrons, what is the formula for the resulting ion?
    7·2 answers
  • How many grams of CO would be required to generate 635 g CO2
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!