Sig Figs and Moles

How many sig figs are in this number: 0.03092?

(a)  

Answer explanation

The decimal is present (Pacific) so I count from the left side starting with the first nonzero number.

How many sig figs is in 3092?

(a)  

Answer explanation

The decimal is ABSENT (Atlantic) so I count from the right side starting with the first nonzero number.

How many sig figs is in 309.200?

(a)  

Answer explanation

The decimal is PRESENT (Pacific) so I count from the left side starting with the first nonzero number.

How many significant figures are in 1020?

(a)  

Answer explanation

The decimal is ABSENT (Atlantic) so I count from the right side starting with the first nonzero number.

How many sig figs are in 1200. ?

(a)  

Answer explanation

The decimal is present (Pacific) so I count from the left side starting with the first nonzero number.

Which digits are significant?

0.0039270

• 0.0039270

• 0.0039270

• 0.0039270

• 0.0039270

Tags

significant figures

Which digits are significant?

36000.

• 36000.

• 36000.

• 36000.

• 36000.

Tags

significant figures

Identify the type of underlined zero.

0.0045040 mm

• Leading

• Trapped

• Trailing

To change mass to atoms, how many conversion factors would need to be used?

• 2

• 3

• 1

• 5

Tags

NGSS.HS-PS1-7

To convert moles to mass one would

• multiply moles given by the molar mass in grams

• divide the moles given by the molar mass in grams

• simply use the molar mass for the given substance

• multiply the average atomic mass by the molar mass