A 2.865 g sample of Iron (III) Chloride hydrate FeCl3∙xH2O was heated at 150°C until a constant mass was achieved (assume all waters have been removed). The mass after heating was 1.719 g Determine the formula of the hydrate

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1.308g of an organic compound containing carbon, hydrogen, and oxygen was analyzed by combustion analysis. 1.797g of carbon dioxide and 1.471g of water vapor were produced. What is the compound's empirical formula? Enter a number in each space. Answers must be numerical - for example, enter "1" not "one".

If 45.0 g of O2 are mixed with 6.70 g of H2 and the mixture is ignited, what massof water is produced?

A 3.000 g sample of a gaseous compound was found to contain 2.560 g of carbon and 0.440 g of hydrogen. A) What is the simplest formula of the compound (Write C first and then H)? You won't be able to make the numbers a subscript. For instance, for MgCl2 enter MgCl2. B) The molar mass of the compound was found to be 42.08 g/mol. What is the molecular formula of the compound? You won't be able to make the numbers a subscript. For instance, for MgCl2 enter MgCl2.

Analysis of a 40 g sample of water revealed a mass percent for lead of 3.23%.  Calculate the number of grams of lead in this sample.

4.62 g sample of methane (CH4) is reacted with 15.1 g of oxygen. What is the maximum amount of water (theoretical yield) which could be formed?

5. An impure sample of magnesium chloride has a mass of 50 g. After perfect purification, 45 g of magnesium chloride is recovered. What is the percentage purity of the original sample?

An engineer has filed for a patent for a brand new allot to be used in golf club heads. The composition by mass ranges from 25 to 31% manganese, 6.3 to 7.8% aluminum , 0.65 to 0.85% carbon, and 5.5 to 9.0% chromium, with the remainder be8ng iron. What are the minimum and maximum percentages of irom possible in this alloy?