Final answer:
In 100.0 g of HBr, you can expect to find approximately 1.235 grams of hydrogen, based on the atomic weights of hydrogen and bromine and the molar mass of HBr.
Step-by-step explanation:
To determine how many grams of hydrogen can be expected in 100.0 g of HBr, you first have to understand the composition of HBr. Hydrogen bromide, HBr, is made up of hydrogen (H) and bromine (Br).
The atomic weight of hydrogen is approximately 1 g/mol, and that of bromine is approximately 80 g/mol. The molar mass of HBr is therefore the sum of the two, which is about 81 g/mol.
Next, you can use the proportion of hydrogen in HBr to find the mass of hydrogen in 100.0 g of HBr. The calculation is as follows:
- Mass of H in 1 mol HBr = 1 g/mol
- Mass of HBr = 81 g/mol
- Proportion of H in HBr = 1 g/mol / 81 g/mol
- Mass of H in 100.0 g of HBr = 100.0 g * (1 g/mol / 81 g/mol) = 1.235 g
Therefore, you can expect to find approximately 1.235 grams of hydrogen in 100.0 g of HBr.