Use Hess’s Law and the following data   CH4(g) + 2 O2(g) → CO2(g)   +  2 H2O(g) ΔH = −802 kJ CH4(g) + CO2(g) → 2 CO(g)   +  2 H2(g) ΔH = + 247 kJ CH4(g) + H2O(g) → CO(g)   +  3 H2(g) ΔH = + 206 kJ   to determine the ∆H°rxn for the following reaction, an important source of hydrogen gas:   2 CH4(g) + O2(g) →  2 CO(g)   +  4 H2(g)   Must show your work (scratch paper) to receive credit.

Use the standard enthalpies of formation provided to calculate the change in enthalpy for the reaction below: C3H8(g)  +  H2(g) → C2H6(g)   + CH4(g)    ΔH°f (kJ/mol) C3H8(g)  -103.85 C2H6(g)  – 84.68 CH4(g)  – 74.6 Must show your work (scratch paper) to receive credit.

Write the condensed (short form) electron configuration for Mo:( 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 ….)

Which depends only on the initial and final state?

Acetylene (C2H2) torches are typically used for welding applications. How much heat in kJ evolve when 2.35 kg of acetylene are burned in excess oxygen gas? The reaction is given by: Must show your work (scratch paper) to receive credit. 2 C2H2(g) + 5 O2(g) → 4 CO2(g) + 2 H2O(l)       ΔH°rxn = – 2599.0 kJ

Sodium metal can react vigorously with water. How much heat evolved with 15.0 g of metallic sodium are thrown in a bucket of water as determined by the following reaction: Must show your work (scratch paper) to receive credit. 2 Na(s) + 2 H2O(l) → 2 NaOH(aq) +  H2(g)     ΔH°rxn = – 368.4 kJ

Write the condensed (short form) electron configuration for Tl, thalium:( 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 ….)

The magnesium spectrum has a line at 266.8 nm. A photon of that light has a frequency of Hz and an energy of J. Must show your work (scratch paper) to receive credit.

Place the following elements in order of increasingelectronegativity.             Cr        Cs        C

Find an equation of the parabola described and state the two points that define the latus rectum.Focus at (0, 3); directrix the line y = -3