Q放=m酒q酒
Q吸=cm水Δt
Q吸=Q放×70%
cm水Δt=0.7×m酒q酒
m水=0.7×m酒q酒/cΔt=0.7×10/1000 kg ×3*×10^7J/kg /4.2 ×10³J/kg·℃ ×10℃
=5kg