Suppose 10 atoms of carbon (C) react with 20 atoms of oxygen (O) to form 10 molecules of carbon dioxide ( CO2). According to the law of conservation of matter, how many atoms are present in this reaction? (1 point)

Question

O 15

Ο 10

Ο 30

20

Answer 1

To determine the total number of atoms present in the reaction, we need to add the number of carbon (C) and oxygen (O) atoms involved in the reaction.

From the information given:

• There are 10 atoms of carbon (C).
• To form 10 molecules of carbon dioxide (CO2), we need 20 atoms of oxygen (O) because each CO2 molecule contains 2 oxygen atoms (10 CO2 x 2 O = 20 O).

Now, let’s sum the total number of atoms:

• Total number of C atoms = 10
• Total number of O atoms = 20

Total number of atoms = C atoms + O atoms = 10 + 20 = 30 atoms

Therefore, the answer is 30.