I am awful at this stuff and i have a few question if anyone can help that would be great

 

1.A 20.00 g slug of Fe heated to 95.0°C was placed into 100.00g of water at 25°C. The specific heat of the Fe is 0.108cal/g°C. The specific heat of water is 1.00cal/g°C. What is the final temperature of the Fe?

2. A bottle of H2SO4 stock solution is 95% H2SO4 (w/v). Its density is 1.84g/ml. Find its molarity. How many millileters of the stock solution must be diluted to make 2.0L of 0.50-M H2SO4 solution?

3. For the following : H2 (g) ------>. 2H (g) ?H° = +436kj/mol Br2 (g) -------> 2Br (g) ?H° =+ 192.5 kj/mol H2 (g) + Br2 (g) -------> 2HBr (g) ?H° = - 72.4kj/mol Calculate ?H° for the reaction H (g) + Br (g) ---------> HBr (g)

4. A 0.5662g sample of an ionic compound containing chloride and an unknown metal is dissociated in water and reacted with an excess of AgNO3. If 1.0882g of AgCl precipitate (solid) forms, what is the % by mass of the Cl in the original compound?

5. A stock solution is 40% CaCl2 (w/v). Assuming that the solution contains 999.0ml of water, at what temperature will the solution boil? Density of water is 1.00g/ml. Kb=0.52°C/molal.

well, what have you done so far? which bits of the working are you stuck at?

 

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