contestada

1. A 10 g gold coin is heated from 25°C to 50°C (CAu is 0.13 J/g-°C). What is the H?
(Points : 1)
+32.5 J

25 J

+25 J

- 32.5 J

I know it is 32.5 J but is it negative or positive... I say it is negative, but I could be wrong...,

Respuesta :

ChemistryHelper2024
The correct answer is + 32.5 J because heat is absorbed here by copper not evolved also after calculation we will find the H value is positive, lets calculate it:
H = m C Δt where:
m = 10 g 
C = 0.13 J/g.°C
Δ t = final temperature - initial temperature = 50 - 25 = + 25 °C
so H = 10 x 0.13 x (+25) = + 32.5 J
 

Answer:

+32.5  J

Explanation: