Blog

What is the v/v percent of a solution made from 330 mL of ethanol and 670 mL of water? 

12) A gas of 0.0340 moles occupies a volume of 40.6 mL at 25 C, what is the pressure of the gas in atm?

Colmar, Inc. incurred the following costs for the month of June in manufacturing gardening tools. Wood handles and metal parts used $  156,000  Advertising $  15,000 Salespersons’ salaries and commissions 22,000  Insurance on factory 13,000 Labor costs for tool assemblers 85,000  Factory manager salary 9,000 Factory equipment depreciation 27,000  Factory building rent 39,000 Office supplies 14,000  Factory utilities 11,000   Total production costs are ____________________

How many moles of K2SO4 are in 15.0 g of K2SO4?  

When 3.00 grams of CH4 are mixed with 5.00 grams of O2 , how much water can be produced?   CH4 + 2O2 → CO2 + 2H2O  

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

For the reaction: 2H2O (l) + 137 kcal → 2H2 (g) + O2 (g) How many kcal are needed to form 2.00 grams of H2 (g)?    

For the reaction below, which substance is oxidized?  2 Zn + O2 –> 2 ZnO

The shape of the nitrogen trichloride molecule is

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