Given the following chemical equation, if 162.0 grams of potassium reacts with excess oxygen gas and was found to produce 172 grams of potassium oxide, what is the percent yield for this reaction?4 K (s) + O2 (g) - - > 2K2O (s)

44%

75%

22%

88%

Determine the number of significant figures in each of the following measurements A). 11 soccer player B). 0.070020 meter C). 10,800 meters D). 0.010 square meter E). 5.00 cubic meters F). 507 thumbtacks

the atomic nubmer of an element is the total number of which particles in the nucleus? protons, neutrons, electrons, protons and electrons

Convert 2.5 miles to km

How is the mass of an object measured?

The atomic masses for elements are the same as the atomic number. relative masses determined by comparison with a standard reference. unknown. actual masses determined by weighing individual atoms.

What is the equivalent mass of HBr in a complete neutralization reaction?

Coal can be converted to methane gas by a process called coal gasification. The equation for the reaction is the following: 2 C (s) 2 H2O (l) - -> CH4 (g) CO2 (g) What mass in grams of carbon is required to react with water to form 1.00 mol CH4

When more than one variable in an experiment is changed at a time, the scientist A. cannot tell which change produced the results. B. cannot accurately measure both variables at the same time. C.

Which statement describes how Earth compares to the moon?

What was your relative pH for bleach? This means there were ___ moles of PH - ions present in bleah.