Using the iron-carbon phase diagram shown below, consider a 2.1 kg of steel alloy containing 1.6 wt% C cooled to below 727 C, the mass content of cementite (kg) is approximately: Composition = 0 wt% Composition = 0 at% Temperature = 0C Temperature = 32 F Composition (at% C) 10 15 20 25 5 1600 1538 "C 1493 C 1400 2500 1394 C 7-L 1200 1147 C 2.14 4.30 42000 Temperature ("C) Austenite 1000 912 C Temperature (F) 7 Fec 800 1500 727C 0.76 600 0.022 4. Ferite 5085 "C a Fe. Cementite (ec) 1000 400 0 2 5 6 6.70 3 4 Composition (wt% C)