Appl Of Ms Excel In Analytical Chemistry
2nd Edition
ISBN: 9781285686691
Author: Crouch
Publisher: Cengage
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Physical Chemistry : Perfect Gases
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The mass of magnesium used in this experiment is critical to determining the moles of
hydrogen gas generated. The analytical balances used in Chemistry 1A labs are very sensitive
to point that touching materials with your fingers before measuring them can affect the
measurements. The balances are sensitive enough to detect dirt and oils from your fingers
transferred to the magnesium. Would your experimental value of R increase or decrease if
the mass of magnesium measured was artificially high due the touching it with your hands?
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Using the balanced equation from Question #8, how many grams of lead will be produced if 2.54 grams ofPbS is burned with 1.88 g of O2? Express your answer to the correct number of significant figures and youmust show all work in the form of dimensional analysis as shown in Lesson 4. (Hint: be sure to work theproblem with both PbS and O2).
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- You have two distinct gaseous compounds made from element X and element Y. The mass percents are as follows: Compound I: 30.43% X, 69.57% Y Compound II: 63.64% X, 36.36% Y In their natural standard states, element X and element Y exist as gases. (Monatomic? Diatomic? Triatomic? That is for you to determine.) When you react gas X with gas Y to make the products, you get the following data (all at the same pressure and temperature): 1. volume gas X + 2 volumes gas Y2 volumes compound I 2. volumes gas X + 1 volume gas Y2 volumes compound II Assume the simplest possible formulas for reactants and products in the chemical equations above. Then, determine the relative atomic masses of element X and element Y.arrow_forward2.) Suppose you're attempting to measure the density of a liquid that is highly volatile (it evaporates quickly). If you first measure the volume and then several minutes later you measure the mass of the liquid will the measured density be higher than the true value, lower than the true value, or the true density of the liquid. [It helps to understand this problem with the density equation.]arrow_forwardA chemist measures the amount of bromine liquid produced during an experiment. She finds that 658. g of bromine liquid is produced. Calculate the number of moles of bromine liquid produced. Be sure your answer has the correct number of significant digits. mol D Xarrow_forward
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- A model for the compound 2,3-dimethylbutanoic acid is shown. 20 F3 E D Write a balanced chemical equation that shows the formation of 2,3-dimethylbutanoic acid from the elements carbon (C), Hydrogen (H₂) and oxygen (O₂). Submit Answer $ ball & stick + labels (Use the smallest integer coefficients possible and do not include states. Enter the elements in the order: C, H, then O in the product box.) 4 DOO DOD F4 R + LL H F [References] Use the References to access important values if needed for this question. 65 % Retry Entire Group F5 + T H Cengage Learning Cengage Technical Support 6 MacBook Air G 9 more group attempts remaining F6 Y - & 7 F7 H U 8 00 FB J 9 F9 K M 0 O A F10 « Previous Email Instructor P Next Save and Exit = A F12arrow_forwardA chemist measures the amount of lodine solid produced during an experiment. He finds that 3.02 g of lodine solid is produced. Calculate the number of moles of iodine solid produced. Be sure your answer has the correct number of significant digits. mot X 5 ?arrow_forwardpshotid=2199... NDTAP Q Search this cou Use the References to access important values if needed for this question. Calculate the number of atoms of hydrogen (H) in 394 cm³ of the colorless gas butane at 25 °C and atmospheric pressure, where its density is 2.38×10³ g cm-3. The molecular formula of butane is C4H10- H atoms Submit Answer 4 question attempts remainingarrow_forward
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