During a lab activity students were given samples of four different unknown elements. The students record their observations as shown in the table

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

What is the percent composition of ca(oh)2? 37.7% ca, 53.0% o, and 10.3% h 45.5% ca, 38.2% o, and 16.3% h 54.0% ca, 43.0% o, and 2.7% h 64.7% ca, 27.0% o, and 8.3% h

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false