Choose all the molecules with zero standard-enthalpy-of-formation (AH% = 0) Fe(s) FeCl2(s) N2(g) H2O(l) 02(g) C(graphite) K(s) H2O(g)

8.5 g of potassium hydroxide (molar mass = 56.1 g/mol) dissolves in 125 g of water and the temperature of the solution increases by 15.58°C. Calculate the AH soln for potassium hydroxide. Assume the specific heat capacity of the solution is 4.2 J.g¨¹.ºC-1. KOH(s) → →K+ K(aq) + OH AH solution = ?kJ/mol (aq)

What will be the final temperature of a 8.79 g piece of iron (CP = 25.09 J/(mol · oC)) initially at 25.0oC, if it is supplied with 302.8 J from a stove?

Identify the set of stoichiometric coefficients that balances the reaction equation for the combustion of the hydrocarbon below: _ C19 H4002 → CO2 + H2O

The cooling system in an automobile holds 11.3 L of ethylene glycol antifreeze. How much energy is absorbed when the temperature of the ethylene glycol goes from 20oC to 100oC? The density and specific heat capacity of ethylene glycol are 1.11 g/mL and 2.42 J/(g ⋅ oC), respectively.

Which statement about the following chemical reaction is not correct? 2NH3+202 →→→ N2O + 3H₂O ○ It requires 2 mol of ammonia to produce 3 mol of water. It requires 2 mol of dioxygen to produce 1 mol of N2O. ○ Nine moles of water are produced when four moles of ammonia are consumed. Two moles of N2O would be produced when four moles of dioxygen are consumed. Two moles of ammonia react with two moles of dioxygen.

If 169.7 g of NaOH (40.0 g/mol) were used to prepare 3411.0 mL of solution, what would the concentration be? Group of answer choices

The mass of 3.6 mol of some element is 576 g. What is the element?

I have a question about this problem involving mechanisms and drawing curved arrows for acids and bases. I know we need to identify the nucleophile and electrophile, but are there different types of reactions? For instance, what about Grignard reagents and other types that I might not be familiar with? Can you help me with this? I want to identify the names of the mechanisms for problems 1-14, such as Gilman reagents and others. Are they all the same? Also, could you rewrite it so I can better understand? The handwriting is pretty cluttered. Additionally, I need to label the nucleophile and electrophile, but my main concern is whether those reactions differ, like the "Brønsted-Lowry acid-base mechanism, Lewis acid-base mechanism, acid-catalyzed mechanisms, acid-catalyzed reactions, base-catalyzed reactions, nucleophilic substitution mechanisms (SN1 and SN2), elimination reactions (E1 and E2), organometallic mechanisms, and so forth."