please answer both questions

EXAMPLE PROBLEM 4.4 Composition Conversion-From Weight Percent to Atom Percent Determine the composition, in atom percent of an alloy that consists of 97 wt% aluminum and 3 wt% copper Solution In we denote the respective weight procent compositions sur 97 and Coubstitution into Equations disa and 4.6 yields Cantor CA X 100 (7)(8355 mol X 100 (976335 g/mol) + (3)(26.98 mot) 98.7 and Co x 100 X 100 CAN Codat cura (3)(26.98 lei 3)26.95 gel) + (978355 /mol 1130 What is the composition, in atom percent, of an alloy that consists of 94 wt.% A1, 4.5 wt% Cu, and 1.5 wt% Mg (simplified composition of the 2024 aluminum alloy)? Part D: Determine the ASTM grain size number if 25 grains per square inch are observed at a magnification of 200 X