Question

porfaa no se como resolver es un tema nuevo

Answer 1

1) Q = m . c . Δt
Q = 750g . 1 cal/(g.C) . 20*C
Q = 15000 cal

Δt = tf - ti = 60*C - 40*C = 20*C

2) c = Q / (m . Δt)
c = 4000cal / (800g . 60*C)
c = 0,083 cal/(g.*C)

3) m = Q / (c . Δt)
m = 12000cal / (0,086cal/(g.*C) . 70*C)
m = 1993,35g