44)What is the volume of 4.00 moles of C02 gas at SIP?
A) 44.8 L
B) 22.4 L
C) 89.6 L
D) 11.2L
45)Which of the following is a chemical property of water?
A)it evaporates
B) it freezes
C)it decomposes into H2 and 02
D)it boils
47)The formula N204 is an example of
A)an ionic formula
B) a structural formula
C) an empirical fonnula
D)a molecular formula
48)What is the gram formula mass of CNH4)3P04?
A) 404 g
B) 121 g
C) 113g
D) 149 g
2006-12-19 14:31:47 · 4 answers · asked by James O 1 in Science & Mathematics ➔ Chemistry
1)Very Difficult : Finding final Volume...
[Archive] Very Difficult : Finding final Volume gasses (for me) Chemistry ... two values (moles of C02 and 02) and you'll...
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4)Formula To Mass To Formula
Welcome to the Formula To Mass To Formula applet page. This applet has been written at Dr. H. Rzepa lab, Chemistry dept,...
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... be used to find the relative formula mass or the molecular formula of an organic ... organic compounds have a relative...
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The atomic mass of a chemical element is the mass of an atom at ... A similar formula mass can be calculated for those...
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Formula To Mass To Formula
2006-12-19 15:41:41 · answer #1 · answered by Byzantino 7 · 3⤊ 0⤋
Answering a number of those questions starts with the help of writing a balanced chemical equation describing the reaction. that is basically what question 2 is all about. A balanced equation would have equivalent numbers of atoms on both area. The kind of molecules does not might want to be equivalent. in this reaction an acid reacts with a base to furnish water and a salt. The acid is glaring, so the bottom would favor to be the bicarbonate, NaHCO3. FYI: the chemical formula for uncomplicated salt is NaCl. What complicates issues is the actual incontrovertible truth that 2 reactions actual ensue. interior the first, bicarbonate react with acid to kind yet another acid: NaHCO3 + HCl -> H2CO3 + NaCl The H2CO3 decomposes rapidly into H2O and CO2, so the finished reaction is: NaHCO3 + HCl -> H2O + CO2 + NaCl the version in mass is the quantity of things generated. I even do not understand of ways a lot a "scoop" is, besides the indisputable fact that the precedence states there is extra HCl used, so this suggests the mass of the dry product is NaCl. 40.06 - 31.fifty 2 = 8.fifty 4 grams NaCl. What you want to appreciate to unravel some thing else of this difficulty is what a mole is A mole is only a quantity chemists use to coach quantity. This many atoms of any element interior the periodic table equals its atomic weight. The kind of moles in a balanced equation is likewise equivalent to the range of molecules. the first element to do is to coach the mass of the products in words of moles. NaCl = 23 + 35.5 = fifty 8.5 grams/mole, so: 8.fifty 4 grams / (fifty 8.5 grams/mole) = 0.146 moles NaCl considering each and each molecule (mole) of NaHCo3 generates a molecule of NaCl, then 0.146 moles of NaHCo3 were fed on. the same is authentic of the water and CO2. to locate the mass, basically multiply the range of moles circumstances the molecular weight of each compound. The theoretical and extremely yield isn't a chance to calculate because you probably did not contain the initial mass of the NaHCO3. From this, the range of moles would were calculated and compared to the moles of product. For all sensible applications, few chemical reactions have one hundred% yields. this suggests the extremely yield will continually be lower than the theoretical (perfect) yield. in this get at the same time, the theoretical yield replaced into the 0.146 moles calculated. You heated the aggregate to force off the water. Water has a diverse molecular weight than salt, so its mass won't be able to be used to calculate the precent yield
2016-11-30 23:48:28 · answer #2 · answered by anuj 3 · 0⤊ 0⤋
44) c- there are 22.4 liters of a gas per i mole of molecules
45)c - the rest are physical properties
47) i think d but i know its not c
48) you need the molecular weight of each individual atom. multiple by how many of that specific atom you have and add the values. YOu need the periodic table for this
2006-12-19 14:43:10 · answer #3 · answered by serpent 2 · 0⤊ 0⤋
44) V = n * 22.4 = 89.6 so c is correct
45) c is correct
46) d is correct
47) ( (N + H*4)*3 + P + O * 4 = 131)
2006-12-19 14:41:36 · answer #4 · answered by James Chan 4 · 0⤊ 1⤋