4. What is the percent composition by mass of hydrogen in NH_(4)HCO_(3)(molar mass=79 g/mol) ? 5.1% 50% 6.3% 10%

To find the percent composition by mass of hydrogen in , we need to determine the total mass of hydrogen in one mole of the compound and then divide it by the molar mass of the compound.1. **Calculate the molar mass of hydrogen in :** - The formula contains 5 hydrogen atoms (4 from and 1 from ). - The atomic mass of hydrogen is approximately . Therefore, the total mass of hydrogen in one mole of is: 2. **Calculate the percent composition by mass of hydrogen:** Therefore, the percent composition by mass of hydrogen in is approximately .