melany100marca melany100marca
  • 14-11-2020
  • Chemistry
contestada

4. The heat of
fusion of a
substance is
80 J/g. How
much energy
is required to
melt 25 g of
the
substance?
A. 2J
B. 25 J
C. 80 J
D. 2 kJ

Respuesta :

Sawpana
Sawpana Sawpana
  • 14-11-2020

It is 2 KJ

It is because the formula is :

q=m∆Hf

where m is the mass and ∆Hf is the heat fusion.

So, we get:

q=80×25

q=2000J or 2 KJ

Answer Link

Otras preguntas

Two volunteer groups plant trees.Group A plants the trees in clusters of 3.Group B plants the trees in clusters of 10 both groups plant the same numbers of tree
In Shakespearean or English sonnets, three quatrains are followed by a couplet. What role does the couplet play in these sonnets? It lets the poet use his or
What was the nature of the Japanese government between the Gempei Wars and the Onin War?
How do i solve this equation? -5x =-40
The coefficients of the expression 3x^4-6x^3+x^2 are ____.
provided loans and aid to merchants and their families
Choose the correct simplification of the expression b5 ⋅ b4
Fish give off the compound and ammonia, which has a pH above 7.2. Which class pof commands does ammonia belong?
What muscles are not under voluntary control?
Help me with all of 9