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Concept explainers
Answer the questions below, using LT (for is less than), GT (for is greater than), EQ (for is equal to), or MI (for more information required) in the blanks provided.
(a) The mass (to three significant figures) of
(b) Boron has two isotopes, B-10 (10.01 amu) and B-11 (11.01 amu). The abundance of B-10 the abundance of B-11.
(c) If S-32 were assigned as the standard for expressing relative atomic masses and assigned an
(d) When phosphine gas, PH3, is burned in oxygen, tetraphosphorus decaoxide and steam are formed. In the balanced equation (using smallest whole-number coefficients) for the reaction, the sum of the coefficients on the reactant side is 7.
(e) The mass (in grams) of one mole of bromine molecules is 79.90.
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Chapter 3 Solutions
CHEMISTRY:PRIN.+REACTIONS-OWLV2 ACCESS
- Atomic masses are relative masses. What does this mean?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_forwardBy x-ray diffraction it is possible to determine the geometric pattern in which atoms are arranged in a crystal and the distances between atoms. In a crystal of silver, four atoms effectively occupy the volume of a cube 0.409 nm on an edge. Taking the density of silver to be 10.5 g/cm3, calculate the number of atoms in one mole of silver.arrow_forward
- With the advent of techniques such as scanning tunneling microscopy, it is now possible to write with individual atoms by manipulating and arranging atoms on an atomic surface. a. If an image is prepared by manipulating iron atoms and their total mass is 1.05 1020 g, what number of iron atoms were used? b. If the image is prepared on a platinum surface that is exactly 20 platinum atoms high and 14 platinum atoms wide, what is the mass (grams) of the atomic surface? c. If the atomic surface were changed to ruthenium atoms and the same surface mass as determined in part b is used, what number of ruthenium atoms is needed to construct the surface?arrow_forwardSalvarsan was long thought to be a single substance. Recently, however, a mass spectrometry study of the compound shows it to be a mixture of two molecules with the same empirical formula. Each has the composition 39.37% C, 3.304% H, 8.741% O, 7.652% N, and 40.932% As. One has a molar mass of 549 g/mol and the other has a molar mass of 915 g/mol. What are the molecular formulas of the compounds?arrow_forwardCisplatin, Pt(NH3)2Cl2, is a chemotherapeutic agent that disrupts the growth of DNA. If the current cost of Pt is $1118.0/troy ounce (1troyoz=31.10g), how many grams of cisplatin can you make with three thousand dollars worth of platinum? How many pounds?arrow_forward
- The present average concentration (mass percent) of magnesium ions in seawater is 0.13%. A chemistry textbook estimates that if 1.00 × 108 tons Mg were taken out of the sea each year, it would take one million years for the Mg concentration to drop to 0.12%. Do sufficient calculations to either verify or refute this statement. Assume that Earth is a sphere with a diameter of 8000 mi, 67% of which is covered by oceans to a depth of 1 mi, and that no Mg is washed back into the oceans at any time.arrow_forwardChalky, white crystals in mineral collections are often labeled borax, which has the molecular formula Na2B4O7 10H2O, when actually they are partially dehydrated samples with the molecular formula Na2B4O7 5H2O, which is more stable under the storage conditions. Real crystals of borax are colorless and transparent. (a) Calculate the percent mass that the mineral has lost when it partially dehydrates. (b) Is the percent boron by mass the same in both compounds?arrow_forwardNitrogen fixation in the root nodules of peas and other legumes occurs with a reaction involving a molybdenum-containing enzyme named nitrogenase. This enzyme contains two Mo atoms per molecule and is 0.0872% Mo by mass. Calculate the molar mass of the enzyme.arrow_forward
- 3.123 Most periodic tables provide molar masses with four or five significant figures for the elements. How accurately would you have to measure the mass of a sample of roughly 100 g to make a calculation of the number of moles of the chemical to have its significant figures limited by the molar mass calculation rather than the mass measurement?arrow_forwardUse the References to access important values if needed for this question. A binary compound of oxygen and an unknown element, X, has the formula X,0 and is 53.55 mass % oxygen. (a) What is the atomic weight of element X? u (b) What is the symbol for the element on the periodic table? X = (c) Is the element X a metal or not? (d) Is the compound X20 likely to be ionic or covalent? (e) What is the name of the compound? Submit Answer 5 question attempts remainingarrow_forward1. (a) 5.00g of caffeine is found to contain 2.47g of carbon, 0.26g of hydrogen, 1.44g of nitrogen and 0.83g of oxygen. The molar mass of caffeine is twice the mass of its empirical formula unit.(R.A.M. C=12.01, H=1.01, O=16.00, N=14.01)(i) Calculate the empirical formula of caffeine.arrow_forward
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