Here are the essential concepts you must grasp in order to answer the question correctly.
Molar Mass
Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in a chemical formula. For disilane, Si2Hx, the molar mass will depend on the number of hydrogen atoms (x) and the atomic masses of silicon and hydrogen.
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Mass Percent Composition
Mass percent composition is the percentage by mass of each element in a compound. It is calculated by dividing the mass of the element in the compound by the total mass of the compound and multiplying by 100. In this case, knowing that disilane contains 90.28% silicon by mass allows us to set up an equation to find the value of x.
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Stoichiometry
Stoichiometry is the calculation of reactants and products in chemical reactions based on the conservation of mass. It involves using mole ratios derived from balanced chemical equations to relate quantities of substances. In this problem, stoichiometry helps us relate the mass of silicon to the mass of hydrogen in disilane to solve for x.
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