Blog

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 ….)

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 ….)

List the elements Na, Ca, Rb, Cl, He in order of decreasing first ionization energy.

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

Find the center, foci, and vertices of the ellipse.4×2 + 49y2 = 196

Find the center, foci, and vertices of the ellipse.4×2 + 5y2 – 48x + 50y + 249 = 0

Find an equation for the parabola described.Vertex at (9, -2); focus at (9, -8)

Complete the square and write the equation in standard form. Then give the center and radius of the circle.x2 + y2 + 6x + 8y + 25 = 16