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isabelvaldez123
isabelvaldez123
29.05.2020 • 
Chemistry

CAN ANYONE HELP ME WITH THESE ASAP? I WILL MARK BRAINLIEST !!

1. Calculate the heat energy for 2.0 g sample of aluminum and the temperature increases from 25°C to 30°C. The specific heat of Al = 0.90 J g–1K–1.

2. What is the method called one could use to find the enthalpy change, ∆H of a combustion of a compound?

3. When the solids Ba (OH)2 and NH4SCN are mixed, a solution is produced and the temperature drops.
Ba (OH)2(s) + 2NH4SCN(s) → Ba (SCN)2(a) + 2NH3(g) + 2H2O(l)
a) Is this an exothermic or an endothermic reaction?

b) Explain why the above reaction is endothermic or exothermic

4. Calculate the ∆H for the reaction
H₂ +F₂→ 2HF
If the bond enthalpies for the molecules are
H-H= 236kJ/mol, F-F =159kJ/mol and F-H =567 J/mol

6. What is the quantity for the spreading of energy over particles (he order / disorder)?

7. What is the equation for Gibbs free energy?

8. Calculate Gibbs free energy for the reaction
2H₂O(l)→2H₂(g)+ O₂(g) If ∆S is 20J/molK and ∆H = - 340kJ/mol at 300 K.

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