How much Hydraset-Free should be used with masonry mortar?

For masonry mortar, two quarts (1.89 L) of Hydraset-Free for each 94 lb. (42.73 kg) bag of cement should be used. For mortar cements that are 50% Portland cement and 50% lime, one-half the amount, or one quart (950 mL), of Hydraset-Free is required.