Answer to Question #117824 in Chemistry for s

Question

What mass of water was used if the temperature went from 55oc to 100oc and the energy used was 65,000 j?

Answer 1

Solution:

The amount of thermal energy stored or released as the temperature of a system changes can be calculated using the equation:

ΔE_tQ = m × c × ΔT

where:

• ΔE_tQ - change in thermal energy (J)
• m - mass (g)
• c - specific heat capacity (J/g°C)
• ΔT - temperature change (°C)

ΔE_tQ = 65000 J

m = unknown

c(H₂O) = 4.184 J/g°C

ΔT = T_final - T_initial = (100 - 55)°C = 45°C

m = ΔE_tQ / (c × ΔT)

m = (65000 J) / (4.184 J/g°C × 45°C) = 345.23 g

m(H₂O) = 345.23 g

Answer: 345.23 g of water (H₂O) was used.