Answer:
You start with 9.4 x 1025 molecules of H2.
You know that an Avogadro's number of molecules of H2 has a mass of 2.0 g.
To solve, 9.4 x 1025 molecules H2 x (2.0 g H2 / 6.023 x 1023 molecules H2) = 312. g H2
Explanation:
C c cccccccccccccccccccccccccccccc =)
Answer: When a substance is pure, it is composed of one type of molecule. For example, table salt is only composed of (more or less) salt molecules, while seawater has water and salt molecules. A more complicated example of a non - pure substance is soil. It has many different types of nutrients and compounds.
1) has 4 sig figs(0s between 2 significant digits are important)
2) has 3 sig figs (the trailing 0s aren’t significant)
3) has 2 sig figs (the trailing 0s aren’t significant)
