The molar mass of nitrogen gas is 28.0g/mol. A 100.0-g sample of air contains how many moles of nitrogen

A 3.00-g sample of an alloy (containing only Pb and Sn) was dissolved in nitric acid (HNO3). Sulfuric acid was added to this solution, which precipitated 2.93 g of PbSO4.

A system used to represent the valence electrons around the chemical symbol of an element is the

Which sample contains the most concentrated solution of hydrochloric acid (HCl) ? A.) 300mL of 1.00M HCl B.) 50mL of 1.45M HCl C.) 800mL of 2.00M HCl D.) 2.00L of 0.90M HCl

Predict whether the equilibria I) CH4 (g) + H2O (g) ⇀↽ CO (g) + 3 H2 (g), ∆H◦ = + 206 kJ II) 2 SO2 (g) + O2 ⇀↽ 2 SO3 (g), ∆H◦ = - 198 kJ will shift toward products or reactants with a temperature increase. 1.

How does refrigeration keep food fresher? 1) Cold air surrounds food and slows the spoiling process. 2) It speeds up reaction rates within stored food. 3) It slows down reaction rates within stored food. 4) It causes food molecules to stop vibrating.

What is the percent composition of sulfur compound that contains 20.8 g carbon and 54.4 g sulfur?

Which of the following is an example of heat transfer by conduction? A. The upstairs of a house being warmer than the downstairs B. Burning your finger on a hot match C. The sun warming your skin D. Being warmed by a fire on a cold night

How much did John save in his 401 (k) in the 2014 tax year?

Explain why the chemical released from the injured fish may not cause in a wa why the chemical released from the injured fish may not cause in alarm response in other fish species

hat historical figure was responsible for developing the system for categorizing living things that is still used today? A) Sir Isaac Newton B) Carolus Linnaeus C) Benjamin Franklin D) Galileo