Answer:
Q = M S ΔT Mass * specific heat water * change in temp
M = Q / (S * ΔT)
ΔT = (91.3 - 31.8) deg C = 59.5 deg C
M = 6220 KJoules / (1.00 kJ / kg deg C * 59.5 deg C)
M = 105 kg
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