Concept explainers
(a)
Interpretation:
The percentage by mass of each element in
(a)
Explanation of Solution
First the molar mass of
Thus one mole of
(b)
Interpretation:
The percentage by mass of each element in
(b)
Explanation of Solution
First the molar mass of
Thus one mole of
(c)
Interpretation:
The percentage by mass of each element in
(c)
Explanation of Solution
First the molar mass of
Thus one mole of
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Chapter 3 Solutions
Chemistry
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- How many moles of beryllium (Be) are needed to completely react with 10.0 moles of N2 in the synthesis of the compound Be3N2?arrow_forwardThe structure of one of the bases in DNA, adenine, is shown here. Which represents the greater mass: 40.0 g of adenine or 3.0 1023 molecules of the compound?arrow_forwardThe active ingredient in Pepto-Bismo® (an over- the-counter remedy for an upset stomach) is bismuth sub-salicylate, C7H5BiO4. Analysis of a 1.7500-g sample of Pepto-Bismol yields 346 mg of bismuth. What percent by mass is bismuth subsalicylate in the sample? (Assume that there are no other bismuth-containing compounds in Pepto-Bismol.)arrow_forward
- Consider the hypothetical reaction 8A2B3(s)+3X4(g)4A4X3(s)+12B2(g)When 10.0 g of A2B3(MM=225g/mol) react with an excess of X4, 4.00 g of A4X3 are produced. (a) How many moles of A4X3 are produced? (b) What is the molar mass of A4X3?arrow_forward3.51 Modern instruments can measure a mass as small as 5 nano- grams. If one observed 5.0 ng of CO2, how many molecules were measured?arrow_forward4.45 If 21 g of H2S is mixed with 38 g of O2 and 31 g of SO2 forms, what is the percentage yield? 2H2S+3O22SO2+2H2Oarrow_forward
- One of the hydrates of Na2CO3 is sodium carbonate decahydrate A 55.6 gram sample of Na2CO3 10 H2O was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, how many grams of the anhydrous compound remained?arrow_forwardThe approximate minimum daily dietary requirement of the amino acid leucine, C6H13NO2, is 1.1 g. What is this requirement in moles?arrow_forward(a) What is the chemical formula of eugenol, the main contri butor to the aroma of cloves? (b) Calculate its molar mass. (c) How many moles are contained in 10.50 g of eugenol?arrow_forward
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