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zhenek [66]
3 years ago
15

Why is using only clean glassware important?

Chemistry
2 answers:
stealth61 [152]3 years ago
6 0

Good laboratory technique demands clean glassware because the most carefully executed piece of work may give an erroneous result if dirty glassware is used. In all instances, glassware must be physically and chemically clean and in many cases, it must be bacteriologic-ally clean or sterile.

Lady_Fox [76]3 years ago
4 0
Keeping glassware physically neat and clean, free of grease, and bacteria is therefore of the utmost importance
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Answer:

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First create your balanced equation. This will give you the stoich ratios needed to answer the question:

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Remember, we need to work in terms of NUMBERS, but the question gives us MASS. Therefore the next step is to convert the mass of O2 into moles of O2 by dividing by the molar mass:

7.72 g / 16 g/mol = 0.482 mol

Now we can use the stoich ratio from the equation to determine how many moles of H2O are produced:

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The question wants the mass of water, so convert moles back into mass by multiplying by the molar mass of water:

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