Three samples of iron with masses of 1.12 grams, 1.8 grams, and 1.562 grams were mixed together. The combined mass of the three samples,
expressed to the correct number of significant figures is

A) 4.4 grams
B) 4.48 grams
C) 4.5 grams

Need answer quickly

The answer is 1.82 j/g°c                  

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na

A.(nh4)(2co3)is the correct answer