1- An unknown compound has the following chemical formula: P2Ox where x stands for a whole number. Measurements also show that a certain sample of the unknown compound contains 5.0mol of oxygen and 3.3mol of phosphorus. Write the complete chemical formula for the unknown compound. 2-Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients. CH3CH2CH3 (g) + O2 (g) → CO2 (g) + H2O (g) 3-An aluminum atom has a mass of 4.48x 10-23 g and a small airplane has a mass of 5000.kg. Use this information to answer the question below. Be sure your answers have the correct number of significant digits. What is the mass of 1 mole of aluminum atoms? ____g 4-  The chemical formula for propane is: CH3CH2CH3 Calculate the molar mass of propane. Round your answer to 2 decimal places. ____ g ⋅ mol-1     5-An electrical engineer measures the frequency of a satellite radio transmission. The frequency is 347GHz. What is the frequency in hertz? Write your answer in scientific notation. ____Hz 6- Write the systemic name of MnSO4 · 5H2O.

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A: Mole to mole ratios can observe by chemical reaction  Fe2O3:HCl=1:6 Fe2O3:FeCl3=1:2 Fe2O3:H2O=1:3

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A: Given that, 4 HCl(g) +O2(g)----------> 2H₂O(g)+2 Cl₂(g) Identify the limiting reagent.

Q: amount of nickel(III) oxide

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A: a)     Reactant which have most initial moles = H2

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A: Since you have posted multiple questions, we are entitled to answer the first only.

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A: Detail mathematical calculation is shown below

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".