its all one questiin with different parts please help

a. How many grams of B are present in 1.84 grams of boron tribromide? Mass=gB b. How many grams of boron tribromide contain 1.75grams of Br ? Mass = g boron tribromide 1. How many grams of Fe3+ are present in 2.84 grams of iron(III) chromate? grams Fe3+. 2. How many grams of iron(III) chromate contain 4.95 grams of Fe3+ ? grams iron(III) chromate. a. How many grams of H are present in 4.24 grams of water? Mass=gH b. How many grams of water contain 4.97 grams of O? Mass= g water 1. How many GRAMS of iron(III) nitrite are present in 2.25 moles of this compound? grams. 2. How many MOLES of iron(III) nitrite are present in 4.00 grams of this compound? moles. 1. How many MOLES of phosphorus trichloride are present in 2.39grams of this compound? moles. 2. How many GRAMS of phosphorus trichloride are present in 3.02 moles of this compound? grams. For the molecular compound boron trifluoride, what would you multiply "moles of BF3 " by to get the units "grams of BF3H ? molesBF3X=gramsBF3 Drag and drop your selection from the following list to complete the answer: 67.8 grams BF3