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1 g wt. = 0.0042 cup
1 cup = 236.59 g wt.
Definition of grams of water provided by Dictionary.com
The basic unit of measurement for mass in the metric system; one cubic centimeter of water has a mass of approximately one gram.
Definition of US cup of water provided by WikiPedia
Pne U.S. cup of water weighs approximately 81⁄3 avoirdupois ounces. Since an imperial cup of water weighs approximately 10 avoirdupois ounces and five imperial cups are approximately equal to six U.S. cups