11) A quantity of gas has a volume of 250. L at 17.0 C and 3.00 atm of pressure. If the gas is cooled to 0.00 C and the pressure is reduced to 1.00 atm, what is the new volume of the gas?

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?  

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