Work Step by Step
We use stoichiometry, making sure that all units cancel out to $Cal$, to obtain: $1670\ kJ \times 1\ Cal/4.18\ kJ=399.5\ Cal$
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.