* OWLV2 | On x2 MolecularP Pearson SiI Molar mas xx OWLV2 | AsMy HometakeAssignment/takeCovalentActivity.do?locator%=assignment-take[Review Topics)[References)Use the References to access Important values If needed for this question.a. How many moles of sulfur hexafluoride, SF6, are present in 1.87 grams of this compound?molesb. How many grams of sulfur hexafluoride are present in 3.48 moles of this compound?gramsSubmit AnswerRetry Entire Group9 more group attempts remainingPreviousNext回ヨ

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a. How many moles of sulfur hexafluoride, SF6, are present in 1.87 grams of this compound? moles b. How many grams of sulfur hexafluoride are present in 3.48 moles of this compound? grams

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter2: Chemical Formulas, Equations, And Reaction Yields

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.

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* OWLV2 | On x
2 Molecular
P Pearson Si
I Molar mas x
x OWLV2 | As
My Home
takeAssignment/takeCovalentActivity.do?locator%=assignment-take
[Review Topics)
[References)
Use the References to access Important values If needed for this question.
a. How many moles of sulfur hexafluoride, SF6, are present in 1.87 grams of this compound?
moles
b. How many grams of sulfur hexafluoride are present in 3.48 moles of this compound?
grams
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Expert Solution

solution of part (a)

• Thus, 0.0128 moles of sulfur hexafluoride are present in 1.87 grams of this compound in correct number of significant figures.

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Cocaine (C17H21O4N) is a natural substance found in the leaves of the coca plant, which has been used for centuries as a local anesthetic and stimulant. Illegal cocaine arrives in the USA either as a pure compound or as the hydrochloride salt (C17H21O4NHCl). At 25oC, the salt is very soluble in water (2.50 kg/L), but pure cocaine is much less so (1.70 g/L). What is the maximum amount of salt (in gram) that can dissolve in 50.0 mL of water? [1 mark.] When a 25 mL aqueous solution that contains 62.50 g of the salt is treated with NaOH, the salt is converted to pure cocaine. How much water (in liters) is needed additionally to dissolve the formed pure cocaine? Round your final answer off to two decimal points. C17H21O4NHCl(aq) + NaOH(aq) → C17H21O4N(aq) + H2O(l) + NaCl(aq)
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