Which of the following two periods contain the same number of element? A. 2 & 3
B.3 & 4
c. 4 & 6
D. 2 & 4​

Aspirin has a density of 1.40 g/cm3 what is the volume in cubic centimeters of a tablet weighing 320 mg ?

Determine the percent sulfuric acid by mass of a 1.61 m aqueous solution of h2so4. %

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.