Iron is obtained commercially by the reaction of hematite (fe2o3) with carbon monoxide. how many grams of iron are produced if 13.0 moles of hematite react with 38.0 moles of carbon monoxide?

According to each substances heat of fusion, which of the items below requires more heat to be added per gram of substance to go from solid to liquid? silver sulfur water lead

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?