When two He atoms undergo fusion in a star, the resulting element is: A) H B) Li C) Be

A is -1214 Ethen 23.molar mass

If the reaction below produces 5,230 kJ of energy, how many grams of KCl will be produced? (KCl = 74.6 g/mol) 2 K (s) + Cl2 (g) → 2 KCl (g) ΔHrxn = –873.0 kJ

The combustion of propane gas (C3H8; molar mass = 44.09 g/mol) occurs according to the following equation:                  C3H8(g)  +  5O2(g)  -->  3CO2(g)  +  4H2O(g)    Given the following standard molar enthalpy of formation (DHof), how much energy in kilojoules is produced when 1.00 g of propane is completely combusted?               DHof[C3H8] = -103.8 kJ/mol;  DHof[CO2] = -393.5 kJ/mol, and  DHof[H2O(g)] = -241.8 kJ/mol          (A) 2043.9 kJ          (B) 531.5 kJ          (C) 12.1 kJ          (D) 46.4 kJ

A scientist measures the standard enthalpy change for this reaction to be 296.0 kJ/mol: H₂S(g) + 2 H₂O(l) 3H₂(g) + SO₂(g) Based on this value and the standard formation enthalpies for the other substances, the standard formation enthalpy of H₂S(g) is kJ/mol. Submit Answer Retry Entire Group 1 more group attempt remaining

The atomic radius for radioactive radon (Rn) is Density for radioactive radon (Rn) is Boiling point for radioactive radon (Rn) is

A) 425.66J/2.0360 g. Convert to kj/mol. Show the work. Molar mass = 39.99 NaOH B) 425.32J/ 1.9532g. Convert to kj/mol. Molar mass = 80.043 Na4NO3

Given the following information: Cao (s) + H20 (1) -- Ca(OH) 2(s) AHO = -62.5 kJ/ mol How many grams of Cao must react in order to liberate 625 kJ of heat? (The molar mass of CaO is 56 g.)

Using the equation for photosynthesis below, answer the following equations 2800kJ + 6 CO: (g) + 6 HeO () > CeHi2Oe (s) + 6 02 (g)