A 40.5 g block of an unknown metal is heated in a hot water bath to 100.0°C. When the block is placed in an insulated vessel containing 130.0 g of water at 25.0°C, the final temperature is 28.0°C. Determine the specific heat of the unknown metal. The cs for water is 4.18 J/g°C.

C = 0.5621J/g°C

Explanation:

Heat lost by metal = Heat gained by water

Heat gained by water;

H = MC ΔT

ΔT = 28 -25 = 3.0°C

M = 130.0g

C = 4.18 J/g°C

H = 130 * 4.18 * 3 = 1639J

Heat lost my metal;

H = MCΔT

ΔT = 100 - 28 = 72°C

M = 40.5g

C = ?

C = H / MΔT

C = 1639 / (40.5 * 72)

C = 0.5621J/g°C

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

i'm pretty sure it is letter c.) car