a. Which of the following are results of forming the concept of the chemical element oxygen? (Select all that apply)

Group of answer choices

1- Hydrogen fuses into helium to produce the Sun's energy

2- The differing molecular weights of copper oxides can be explained in terms of number of oxygen atoms per copper

3- The small numbers of ratios of chemical elements to one another in compounds can be formulated as a rule by correct counts of the numbers of atoms in compounds

4- he concept of atomic weight can be validated with correct counting of oxygen atoms in compounds that include oxygen

b. Which of the following are statements that support the induction of the atomic theory of matter? (Select all that apply)

Group of answer choices

1- Democritus postulated that there is a level beyond which objects can not be divided further

2- Chemical elements are pure substances that cannot be chemically broken down further

3- Heat flows spontaneously from hotter to colder regions

4- Chemical elements combine in small number ratios to form compounds

c. 8.3 cubic meters of oxygen gas at 100,000 pascals of pressure have a temperature of 100 K. If the ideal gas constant R is 8.3 Pa m³ / (mol K), how many mol of oxygen molecules is in this sample of oxygen?

Group of answer choices (one answer only)

0.1

1

10

100

1,000

10,000

100,000