Chemistry, 28.05.2020 06:58 endermss1970

1. In an experiment, 0.25 grams of iron and 0.25 grams of sulfur are heated in a test tube to create a new
substance. What is the percent composition by mass of each element in the new compound?
2. A chemist breaks down a compound into 3.4 grams of carbon and 6.8 grams of oxygen. What is the percent
composition by mass of each element in the compound?
3. In an experiment, 2.0 g of oxygen reacts with 80.1 g of calcium to form a new compound. What is
the percent composition by mass of each element in the new compound?
4. What is the percent composition by mass for each element in lithium phosphate, Li3PO4?
5. What is the percent composition by mass for each element in iron (III) carbonate, Fe2(CO3)3?

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a electronegativity decreases beacuse the size of nucleus is bigger.

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I'm sorry but i'm only grade

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Cis the answer to your question

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balanced chemical equations follow the law of conservation of mass and charges. the masses and charges on either sides of the equation should be balanced.in conservation of mass, the number of atoms of each element on left side should be equal to the number of atoms of each element on the right side of the equation.1)k₂so₄ + 2ca(no₃)₂ --> 2kno₃ + 2caso₄number of ions left side right side k⁺ 2 2so₄²⁻ 1 2ca²⁺ 2 2no₃⁻ 4 2in this equation the masses of so₄²⁻ and no₃ are not balanced. therefore this equation violates the law of conservation of mass2)ti + 2 cl₂ > ticl₄ left side right side ti 1 1cl 4 4this equation follows the law of conservation of mass3)2c₂h₂ + 5o₂ > 4co₂ + 2h₂o left side right side c 4 4h 4 4o 10 10this equation follows the law of conservation of mass4)baso₄ + 2naoh --> ba(oh)₂ + na₂so₄ left side right side ba 1 1so₄²⁻ 1 1na 2 2 oh⁻ 2 2this equation follows the law of conservation of massanswer is 1st equation

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