Q:

One mole of a chemical element contains approximately 6.02 × 1023 atoms. How many atoms are present in 4.6 × 104 moles of oxygen? Represent the answer in scientific notation. Round so the first factor goes to the hundredths place.A. 2.77 × 10^27 atomsB. 2.77 × 10^28 atomsC. 27.7 × 10^27 atomsD. 27.7 × 10^28 atoms

Accepted Solution

A:
Answer: B. 2.77 · 10^28Step-by-step explanation:The total number of atoms is ... (6.02·10^23 atoms/mol)·(4.6·10^4 mol) = (6.02·4.6)·10^(23+4) atoms ≈ 27.7·10^27 atoms ≈ 2.77·10^28 atoms . . . . . . put in scientific notation form_____Scientific notation has one non-zero digit to the left of the decimal point and the exponent adjusted accordingly.__Your calculator can help you figure this out. If necessary, put the display into scientific notation mode. (For numbers this size, it is usually not necessary.)