2. There is a need to make many 10mm holes in a rubber hose. It is not hard to punch or drill holes except that the hose is very flexible. It stretches, compresses and bends. So, making the holes accurately is a complicated task. The supervisor tried to burn the holes with a heated iron rod, but the edges of these holes were uneven and brittle. "Nothing can be done! How annoying!" exclaimed the exasperated supervisor. How could it be done?

2. There is a need to make many 10mm holes in a rubber hose. It is not hard to punch or drill holes except that the hose is very flexible. It stretches, compresses and bends. So, making the holes accurately is a complicated task. The supervisor tried to burn the holes with a heated iron rod, but the edges of these holes were uneven and brittle. "Nothing can be done! How annoying!" exclaimed the exasperated supervisor. How could it be done?

Introductory Chemistry: A Foundation

9th Edition

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter1: Chemistry: An Introduction

Section: Chapter Questions

Problem 13ALQ

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A student is given a sample of a pink manganese (II) chloride hydrate. She weighs the sample in a dry, covered crucible and obtains a mass of 26.742g for the crucible, cover, and sample. Earlier she had found that the crucible and cover weighed 23.599g. She then heats the crucible to drive off the water of hydration, keeping the crucible at red heat for about 10 minutes with the cover slightly ajar. She then lets the crucible cool and finds it has a lower mass; the crucible, cover and contents then weigh 25.598g. In the process the sample was converted to off-white anhydrous MnCl2. a. What was the mass of the hydrate sample? _ghydrate b. What is the mass of the anhydrous MnCl2? _gMnCl2 c. How much water was driven off? _gH2O d. What is the percent by mass of water in the hydrate? water=massofwaterinsamplemassofhydrateinsample100 _massH2O e. How many grams of water would there be in 100.0g hydrate? How many moles? _gH2O; _molesH2O f. How many grams of MnCl2 are there in 100.0g hydrate? How many moles? What percentage of the hydrate is MnCl2? Convert the mass of MnCl2 to moles. The molar mass of MnCl2 is 125.85g/mol. _gMnCl2; _molesMnCl2 g. How many moles of water are present per mole MnCl2? _ h. What is the formula of the hydrate? _
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#2, The answer is already there. I just need to learn how to do the work
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