According to the principle of calorimetry, ‌Q‌gained ‌=Q‌lost ‌ ⇒m‌water ‌×C‌water ‌×∆T=m‌steam ‌×L‌steam ‌+m‌steam ‌×C‌water ‌×∆T ⇒114×1×(70−30)=m‌steam ‌×540+m‌steam ‌×1×30 ⇒m‌steam ‌=8g ∴‌‌ Total mass of water ‌=m‌water ‌+m‌steam ‌ =‌114+8=122g