Appl Of Ms Excel In Analytical Chemistry
2nd Edition
ISBN: 9781285686691
Author: Crouch
Publisher: Cengage
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4. (a) What is the difference between adding subscript 2 to the end of the formula
for CO to give CO2 and adding a coefficient in front of the formula to give 2CO?
(b) Is the following chemical equation, as written, consistent with the law of
conservation of mass?
3Mg(OH)2 (s) + 2H3PO4 (aq)
Why or why not?
Mg3(PO+)2 (s) + H2O (I)
(a) Calculate the molar mass of ammonium nitrate, NH4NO3. (b) What is the mass percent of nitrogen in ammonium nitrate? (c) How many kilograms of nitrogen are present in a 10.0-lb bag of ammonium nitrate? (d) How many kilograms of ammonium nitrate contain 1.00 lb of nitrogen? (1 lb = 453.6 g)
(a) A compound MX2 is formed from the M²+ and X ions. The compound contains 86.8% of X by
mass. In a reaction, a 0.96 g M²+ ion reacts completely with 0.079 mol X¯ ion. Determine the
identity of M²+ and X.
(b) In a reaction, the mixture of 13.4 g of calcium fluoride (CaF₂) and 11.1 g of sulfuric acid
(H₂SO4) was heated to give off gaseous hydrogen fluoride (HF). The reaction is as shown:
CaF2 (s) + H₂SO4 (1) → 2HF (g) + CaSO4 (s)
Determine the maximum amount (grams) of hydrogen fluoride that can be obtained.
(c) A compound containing barium (Ba) and oxygen, weighed 2.018 g, was dissolved to produce
barium ions in solution. The barium ions are then separated from the solution by precipitating
method. The precipitate formed was 3.018 g of BaCrO4. Determine the chemical formula of
the compound.
(d) For the following reaction, determine the mass of sulfur would be needed to obtain 80.0 g of
CS₂. The percent yield of the reaction is consistently 92%.
CH4 (g) + 4S (g) → CS2 (g) + 2H₂S (g)
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- 4-102 Aspartame, an artificial sweetener used as a sugar substitute in some foods and beverages, has the molecular formula C14H18N2O5. (a) How many mg of aspartame are present in 3.72 × 1026 molecules of aspartame? (b) Imagine you obtain 25.0 mL of aspartame, which is known to have a density of 1.35 g/mL. How many molecules of aspartame are present in this volume? (c) How many hydrogen atoms are present in 1.00 mg of aspartame? (d) Complete the skeletal structure of aspartame, where all the bonded atoms are shown but double bonds, triple bonds, and/or lone pairs are missing. (e) Identify the various types of geometries present in each central atom of aspartame using VSEPR theory. (f) Determine the various relative bond angles associated with each central atom of aspartame using VSEPR theory. (g) What is the most polar bond in aspartame? (h) Would you predict aspartame to be polar or nonpolar? (i) Is aspartame expected to possess resonance? Explain why or why not. (j) Consider the combustion of aspartame, which results in formation of NO2(g) as well as other expected products. Write a balanced chemical equation for this reaction. (k) Calculate the weight of C02(g) that can be prepared from 1.62 g of aspartame mixed with 2.11 g of oxygen gas.arrow_forward4-78 (Chemical Connections 4A) How does fluoride ion protect the tooth enamel against decay?arrow_forward4-53 A typical deposit of cholesterol, C27H46O, in an artery might have a mass of 3.9 mg. How many mol ecules of cholesterol are in this mass?arrow_forward
- You take 1.00 g of an aspirin tablet (a compound consisting solely of carbon, hydrogen, and oxygen), burn it in air, and collect 2.20 g CO2 and 0.400 g H2O. You know that the molar mass of aspirin is between 170 and 190 g/mol. Reacting 1 mole of salicylic acid with I mole of acetic anhydride (C4H6O3) gives you 1 mole of aspirin and 1 mole of acetic acid (C2H4O2). Use this information to determine the molecular formula of salicylic acid.arrow_forwardChlorine exists mainly as two isotopes, 37Cl and 33Cl. Which is more abundant? How do you know?arrow_forwardPhosphoric acid, H3PO4, can be prepared by the reaction of phosphorus(V) oxide, P4O10, with water. 14P4O10(s)+32H2O(l)H3PO4(aq);H=96.2kJ What is H for the reaction involving 1 mol of P4O10? P4O10(s)+6H2O(l)4H3PO4(aq)arrow_forward
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- (a) What is the difference between adding subscript 2 to the end of the formula for CO to give CO2 and adding a coefficient in front of the formula to give 2CO? (b) Is the following chemical equation, as written, consistent with the law of conservation of mass? 3Mg(OH)2 (s) + 2H3PO4 (aq) ------> Mg3(PO4)2 (s) + H2O (l) Why or why not?arrow_forward(a) How many moles of ammonium ions are in 0.642 g of ammonium carbonate? 8.04e21 X mol (b) What is the mass, in grams, of 0.0631 mol of iron (III) phosphate? X g (c) What is the mass, in grams, of 3.66 x 1023 molecules of aspirin, C9H8O4? X 9 (d) What is the molar mass of diazepam (Valium(R)) if 0.05570 mol weighs 15.86 g? X g/mol Submit Answerarrow_forwardThe molecular formula of allicin, the compound responsible for the characteristic smell of garlic, is C6H10OS2. (a) What is the molar mass of allicin? (b) How many moles of allicin are present in 5.00 mg of this substance?arrow_forward
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