Question

What is the molar mass of oxygen, O2? (Round to four significant figures only.)

Answer 1

16.00*2 = 32.00 Molar mass

Answer 2

Answer:
`3.200* 10^(1)`

Step-by-step explanation:

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number
`6.023* 10^(23)` of particles.

1 mole of
`O_2` weighs= 32.0 g

Significant digits are each of the digits of a number that are used to express a number to the required degree of accuracy, starting from the first non-zero digit with exponents raised to the power of 10.

The number is written in scientific notation as
`6.022* 10^(23)` contains 4 significant digits.

Thus 32 can be expressed as
`3.200* 10^(1)` contains 4 significant digits.