Use the periodic table to find the molar mass of each of the following elements. Sodium (Na) : g/mol Oxygen (O) : g/mol Carbon (C) : g/mol

name two gases of air which dissolve in water by diffusion what is the importance of this process in nature?

What are all structures that make up the immune system?

Which important change in electronic devices, such as televisions and computers, is a result of the use of metalloids as semiconductors? A) Electronic devices have become smaller. B) Electronic devices are now more brittle.

At a given temperature, the vapor pressure of pure acetone (CH3COCH3, 58.00 g/mol) is 342 torr. At the same temperature, the vapor pressure of pure chloroform (CHCl3, 119.35 g/mol) is 230 torr. Consider a solution containing 23.2 g of acetone and 73.

The complete combustion of acetylene, C2H2 (g), produces 1300. kJ of energy per mole of acetylene consumed. How many grams of acetylene must be burned to produce enough heat to raise the temperature of 1.00 gal of water by 12.

Which of the following compounds will produce H2O as one of the products when it decomposes? a.) Hg (ClO3) 2 b.) Cu (OH) 2 c.) CaO d.) MgCO3

After 10 years, 75 g of an original sample of 100 g of a certain radioactive isotope has decayed. the half-life of the isotope is

When 10.7 g of Al are reacted with 42.5 g of HCl, what volume of H2 will be produced at 47 C and 725 mmHg? Formula: 2Al+6HCl=2AlCl3+3H2

Increasing the temperature increases the rate of a many reactions by:

2A balloon filled with helium occupies 20.0 L at 1.50 atm and 25°C. How many moles of helium will there be in the balloon at STP? A. 22.4 moles B. 1.12 moles C. 0.0446 moles D. 0.893 moles E. 1.23 moles F. 4.55 moles