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Which of the following (with specific heat capacity provided) would show the largesttemperature change upon gaining 200.0 J of heat?

In which case is the work done on the system always positive?

An endothermic reaction has

A 91.9 MHz radio transmitter has a wavelength of [a] m and an energy of [b] J. Must show your work (scratch paper) to receive credit.  

Propane gas (C3H8) is used in most gas grills. What is the amount (in grams) required to generate 275.0 kJ of heat? Must show your work (scratch paper) to receive credit. C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(l)       ΔH°rxn = -2219.9  kJ 

Use the standard enthalpies of formation provided to calculate the change in enthalpy for the reaction below: 2 Cl2(g)  +  2 H2O(l) → 4 HCl(g) + O2(g)            ΔH°f (kJ/mol) H2O(l)  -285.8 HCl(aq)  -167.2 HCl(g)  -92.3  Must show your work (scratch paper) to receive credit.

Write the condensed (short form) electron configuration for Fr:( Make sure to follow the order following the Aufbau principle. Do not consider exceptions. Do not use superscripts, do not write the brackets on the noble gas. Use the following format Ne – 3s2 ….)

Given the data:  N2H4(l) + O2 (g) → N2(g) + 2 H2O (l) ΔH° = – 622.2 kJ 2 H2(g) + O2 (g) → 2H2O (l) ΔH° = -571.6 kJ H2(g) + O2 (g) → H2O2(l) ΔH° = – 187.8 kJ   using Hess’s Law the ∆H for the reaction below is [a] kJ:N2H4 (l) + 2 H2O2 (l) → N2(g) + 4 H2O (l)Must show your work (scratch paper) to receive credit.

Given the following equations and ∆H° values:                                                               OF2(g) + H2O(l) → O2(g) + 2 HF(g) ∆H° = -276.6 kJ SF4(g) + 2 H2O(l) → 4 HF(g) + SO2(g) ∆H° = -827.5 kJ S(s) + O2(g) → SO2(g) ∆H° = -296.9 kJ  determine the heat of reaction (kJ) at 298 K for the reaction:  2 OF2(g) + 2 S(s) →SO2(g) + SF4(g) Must show your work (scratch paper) to receive credit.

Write the full electron configuration for Ti: (Do not consider exceptions. Make sure to follow the order following the Aufbau principle, use the following format without superscripts: 1s2 2s2 2p6…)