How much heat is absorbed by a 26g iron skillet when its temperature rises from 5oc to 25oc?

The heat capacity for iron is 0.444

Equation

H = m * c * deltat

Givens

m = 26 grams

c = 0.444 J/(g oC)

Δt = 25° - 5° = 20°

Solution

H = 26 grams * 0.444 J/g * C° * 20°

H = 231 = 2.31 * 10^2 technically there should only be 1 sig digit, but I'll give you 3. You can do the rounding.

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2