ASAP PLZ The table shows the amount of radioactive element remaining in a sample over a period of time. Radioactive Decay Rate Amount of Radioactive Sample (grams) Time (years)
56.0--0
47.1---400
39.6--800
33.3 --1,200
281,600
Part 1: What is the half-life of the element? Explain how you determined this. Part 2: How long would it take 312 g of the sample to decay to 9.75 grams? Show your work or explain your answer.

In this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced?

Match the following vocabulary terms to their definitions. 1. amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point 2. a measure of the kinetic energy of the particles of a substance 3. the amount of heat energy required to raise the temperature of 1 gram of liquid water from 14.5°c to 15.5°c 4. amount of energy required to change 1 gram of material from the liquid to the gaseous state at its boiling point 5. the amount of energy required to change 1 gram of a substance 1°c a. temperature b. latent heat of vaporization c. latent heat of fusion d. calorie e. specific heat

How many atoms of mg are present in 97.22 grams of mg? 6.022 × 1023 2.408 × 1024 4.818 × 1024 5.855 × 1025