How many grams of water, H2O, are present in 2.5 moles of H2O?  

Which reaction below (A – E) is a double replacement reaction? A. CuCO3 –> CuO + CO2 B. 2 NaCl + Pb(NO3)2 –> 2 NaNO3 + PbCl2 C. CH4 + O2 –> CO2 + H2O D. Cu + 2 AgNO3 –> 2 Ag + Cu(NO3)2 E. C + 2 Cl2 –> CCl4

In the reaction of nitrogen gas, N2, with hydrogen gas, H2, to form ammonia gas, NH3 , how many moles of hydrogen are needed to react with two moles of nitrogen? (Hint: write a balanced equation)  

What is the molar mass of copper(II) phosphate  Cu3(PO4)2  

How many moles of carbon atoms are there in 0.500 mole of C2H6?  

If the electronegativity difference between elements X and Y is 0.8, the bond between the elements X-Y is

Sulfur-35 has a half-life of 84 days. How many days have elapsed after 4 half-lifes?  

Which one of the following compounds contains an ion with a 2+ charge?  

The focus of commercial organizations is profitability.  The focus of governmental entities is:

Which of the following steps in the acquisition of goods and services occurs first?