How many significant figures are in the number 1.250

Reduce the number 75246.22 to 3 significant figures

Reduce the number 5601.452 to 5 significant figures

If there are 7.55 g of CuNO3 in a 0.230 M solution, what is the total volume of the solution in mL?

How many significant figures are in the number 0.0021

How many significant figures are in the number 312.10

Which substance(s) are ones unlikely to conduct in aqueous solution?  Select all appropriate choices (and note, more than 1 right answer is possible).

The frequency of an unknown wave of light is 7.25 x 1015 Hz.  What wavlength (in nm) is this light correspondance to?   NOTE: c =

Which subshell does not exist?

Which of the following species is isoelectronic to Ar?3