Hello, I am struggling with these four question. I would be grateful for the hel

Question

Hello,

I am struggling with these four question. I would be grateful for the help.

1.If 77.8 J of energy is required to raise the temperature of 12.0 grams of solid iron to 36.3oC, the initial temperature must be __________oC   Record answer to three significant figures. The specific heat capacity of iron is 0.45 J/goC.

2.Determine DrH

R + S rightarrow deltaH degree = -50kJ T + S rightarow Z deltaH degree = -150kJ Net R + 2s rightarrow Z deltaH degree = -200kJ A. arrow C Step (1) in the reaction is represented by B. line E Step (2) in the reaction is represented by C. line D The net reaction is represented by D. arrow B The reactants, R + 2S, are represented by E. arrow A The product, Z, is represented by F. line F The intermediate, T, + S is represented by B A Identify the line segment where the removal of heat will ca use the sample to freeze. A. A , B Identify the point(s) on the following diagram where gas and liquid are definitely both present B.C Identify the point(s) on the following diagram where solid and liquid are definitely both present D. DB Identify the point(s) on the following diagram where the temperature is such that only the solid can be present E. H. J Identify the point(s) on the following diagram where the temperature is such that only the gas can be present

Explanation / Answer

1.) (A very easy way to remeber this formula is Q=m Cat, that delta below would be a triangle and thus it make remembering this formula quite easy. It's also a very important formula to memorize!)

Q=m

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