This is a list of ASTM International standards.Standard designations usually consist of a letter prefix and a sequentially assigned number. This may optionally be followed by a dash and the last two digits of the year in which the standard was adopted.
B27-36 Methods of Chemical Analysis for Sulfur in Special Brasses and Bronzes (Withdrawn 1942) B28-36 Methods of Chemical Analysis of Special Brasses and Bronzes (Withdrawn 1942) B31-28 Specification for Copper-Base Alloys in Ingot Form for Sand Casting (Withdrawn 1932) B35-36 Methods of Chemical Analysis of Pig Lead (Withdrawn 1941)
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Oct 17, 2019· The "roasting" of 100 g of a copper ore yielded 75.4 g of 89.5 % pure copper. If the ore is composed of Cu2Sand CuS with 11.0 % inert impurity, calculate the percent of Cu2S in the ore. A. 62 % B. 38 % C. 74 % D. 28 % 11.