Which of the following reactions is balanced? A)

Sn2+ + 2Fe3+ → Sn4+ + 2Fe2+

B)

Sn2+ + 2Fe3+ → Sn4+ + Fe2+

C)

Sn2+ + Fe3+ → Sn4+ + Fe2+

D)

2Sn2+ + Fe3+ → 2Sn4+ + Fe2+

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

The valence of aluminum is +3, and the valence of the chlorine is -1. the formula fir the aluminum chloride is correctly written as

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]