Answer:
There would be 45 hydrogen atoms.
Step-by-step explanation:
The only thing you need to focus on is hydrogen, since thats what the questions wants. With that said, take away every other part of the molecule.
ONLY KEEP WHATS ATTACHED TO THE H.
It says that there are 7 Hydrogen atoms in the molecule right? So you take the 7 and multiply it by the 5 molecules that they want. (7x5=45)