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tahlialafaye
24.09.2019 •
Chemistry
Acompound contains 69.94 percent iron and 30.06 percent oxygen. what is its molecular formula if the molar mass of the compound is 199.55 grams per mole?
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Ответ:
The molecular formula is Fe₂O₃
Explanation:
The molar mass of the compound is 199.55 g/mol; this means that if we have 1 mol of the compound, we'd have 199.55 g, we'd also have:
199.55 * 69.96/100 = 139.57 g of iron199.55 * 30.06/100 = 59.98 g of oxygenNow we calculate the moles of each element present in the given masses, using their atomic masses:
139.57 g Fe ÷ 55.84 g/mol = 2.50 mol Fe59.98 g O ÷ 16 g/mol = 3.75 mol OThen in 1 mol of the compound, there's 2.50 mol Fe and 3.75 mol O:
Fe₂.₅O₃.₇₅We convert the coefficients into integers (Divide them by the lowest number among them and multiply them by two):
Fe₂O₃Ответ:
Combination or synthesis
Explanation:
The chemical reaction is given as:
2N₂ + O₂ → 2N₂O
From the reaction above we see that this is a combination reaction. In a combination reaction, two or more species combines to give a product.
The formation of compounds from the union of their constituent elements falls into this category of reaction.This combination reaction is also known as a synthesis reaction.