How many moles of oxygen are needed to burn 425g of sulfur

Imagine that you have produced several versions of lactase, each of which differs from normal lactase by a single amino acid. describe a test that could indirectly determine which of the versions significantly alters the three-dimensional shape of the lactase protein.

Iron (3) oxide will decompose in the presence of hydrogen gas and heater to produced iron and digydrogen monoxide white a balanced chemical equation

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?