Given the data:  Ca(s) + ½ O2(g) → CaO(s)  ΔH = −635.1 kJ CaCO3(s) → CaO(s) + CO2(g) ΔH = 178.3 kJ using Hess’s Law the ∆H for the reaction below is [a] kJ:2 Ca(s) + O2(g) + 2 CO2(g) →  2 CaCO3(s)Must show your work (scratch paper) to receive credit.

Nitric acid is neutralized by the reaction with calcium hydroxide by the following reaction: Ca(OH)2(s) + 2 HNO3(aq) →  Ca(NO3)2(aq) +  2 H2O(l) What volume (L) of 0.250 M HNO3 is required to neutralize 17.5 g Ca(OH)2? Must show your work on scratch paper to receive credit.

The element X has three naturally occurring isotopes. The isotopic masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is ________ amu.             Isotope Abundance (%) Mass 164X 30.60 159.37 164X 15.79 162.79 164X 53.61 163.92  

How many electrons, protons, and neutrons are present in the following isotopes  protons: [a], neutrons: [b], electrons: [c] 

The following reaction:  calcium carbonate producing calcium oxide and carbon dioxide, is an example of 

When solutions of an acid and a base are reacted, the products are    

How many grams of hydrogen gas would be produced when 6.0 grams of magnesium react with excess of an acid?   Mg + 2 HCl → MgCl2 + H2    

In a reaction to produce chlorine gas, the theoretical yield is 25.6 g. What is the percent yield if the actual yield is 20.2 g?  

The reaction: N2 + O2 + 182.6 kJ → 2NO, is

How many grams of water will be required to completely react with 1.00 mol of CaO according to the following reaction?   CaO + H2O → Ca(OH)2