3.5 x 10^15 atoms of sodium to moles of sodium

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone

What substance has a mass of 9.5g and volume of 2.1cm^3

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?