Barium iodide contains 35.1% barium by mass. an 8.50 g sample of barium iodide contains what mass of iodine

How much heat is released upon converting one mole of steam (18.0 g) from 100.0 ∘c to water at 25.0 ∘c? show work and constants, trying to figure out how it works. only given the heat capacity for steam and water so try to only use that

Predict the products butane (c4h10) + oxygen —>

What is the percent by mass of oxygen in fe2o3