According to the balanced equation from Experiment 8 for the produced hydrogen gas, if 12.0 L of hydrogen gas was collected over water at 20.0 °C and 821 torrs, how many grams of Mg must have reacted? (R = 0.0821 L atm/ mol K) ​

Group of answer choices

12.5 g

12.8 g

13.0 g

12.7 g

Why should the scientific method be used to answer a question? a. it provides a way to test an idea without any bias. b. it provides a way to test a hypothesis. c. it provides a way to ensure all hypotheses are proven correct. d. it provides a way to quickly turn a hypothesis into a scientific theory.

Which type of reaction always has an element and a compound as reactants

All of the following are part of the biosphere except