Which one of the following contains 75.0% carbon by mass?

How many moles and how many atoms of copper are in a sample weighing 68.0 g?

Ammonia can be synthesized by the reaction:2 NO(g) + H2(g) → 2 NH3 + 2 H2O (g)Starting with 40.0 g of NO and 25.6 g H2, find the theoretical yield of ammonia in grams.

What is the molar mass of CaCO3?

Which of the following has the greatest mass?

What is the chemical symbol for sodium?

What symbol is used to represent the factor 10-9?

Methane, CH4, reacts with oxygen to form carbon dioxide and water. What is the stoichiometric coefficient for oxygen when the chemical equation is balanced using the lowest whole-number stoichiometric coefficients?

The density of aluminum is 2.702 g/cm3. What is the final liquid level of water if 2.260 ounces of aluminum is dropped into a graduated cylinder containing 15.90 mL of water? (1 oz = 28.35 g)

A certain solid has a density of 16.0 g/cm3. If 8.0 g of this solid are poured into 4.00 mL of water, which drawing below most closely represents the volume of water after the solid is added?