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alexandr402 [8]
3 years ago
9

1.50μm2. Convert this to square meters.

Chemistry
1 answer:
mars1129 [50]3 years ago
6 0
Based on the standards of units conversion, to convert from micrometer to meter, we multiply by 10^-6.
Since we there is a square (10^2) to consider, then to convert from micrometer squared to meter squared, we will multiply by (10^-6)^2 as follows:
1.5 <span>μm2 = 1.5 x (10^-6)^2 = 1.5 x 10^-12 meter sqaures</span>
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40.2 grams of Hydrogen Chloride (HCl) is decomposed. 12 grams of Chlorine (Cl) is formed. How many grams of Water (H2O) was form
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Answer:

3.05 g

Explanation:

The reaction that takes place is:

  • 4HCl + O₂ → 2Cl₂ + 2H₂O

As the decomposition not necessarily was complete we'll work with the<em> given mass of product formed</em>. We convert <u>the 12 grams of chlorine to moles</u>, using its <em>molar mass</em>:

  • 12 g ÷ 70.906 g/mol = 0.169 mol

Then we <u>convert Cl₂ moles to H₂O moles</u>:

  • 0.169 mol Cl₂ * \frac{2molH_2O}{2molCl_2} = 0.169 mol H₂O

Finally we <u>convert moles to grams</u>:

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3 years ago
An accounting report that shows the changes in capital during the accounting period is a/an
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The answer is C. statement of owner's equity
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Select the statements below that are false and think about why they are not true.
Anna007 [38]

Answer:

a) and d) are false.

Explanation:

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For a spontaneous process:

ΔSuniv = ΔSsys + ΔSsurr > 0

For a spontaneous process, the second law says that ΔSuniv must be greater than  zero, but it does not place a restriction on either ΔSsys or ΔSsurr. Thus, it is possible  for either ΔSsys or ΔSsurr to be negative, as long as the sum of these two quantities  is greater than zero.

d) <u>A  reaction that does occur under the given set of conditions is called a</u> spontaneous  reaction. We observe spontaneous physical and chemical processes every day,  including many of the following examples:

• A waterfall runs downhill, but never up, spontaneously.

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5 0
3 years ago
Brass is an alloy of copper and zinc. varying the mass per- centages of the two metals produces brasses with different proper- t
EastWind [94]

First step: The mass of zinc in the yellow zinc sample can be calculated with the help of percentage (given) in the sample. After that, mass of copper is determine by the subtracting the mass of zinc from the total mass of zinc in the given sample.

Thus,

Mass of zinc in 34% zinc sample = 185 g yellow zinc \times \frac{34 zinc}{100 yellow zinc}

= 62.9 g zinc

Mass of zinc in 37% zinc sample = 185 g yellow zinc \times \frac{37 zinc}{100 yellow zinc}

= 68.45 g zinc

Now,

mass of copper in 34% zinc sample =185 g -62.9 g

= 122.1 g \simeq 122 g

mass of copper in 37% zinc sample = 185 g -68.45 g

=116.55 g \simeq 117 g

Thus, the range of mass of copper is 117 g to  122 g

Second step:

34% zinc sample consist of 66% copper (100-34= 66%)

37% zinc sample consist of 63% copper (100-37=63%)

Mass of zinc = (46.5 g copper) \times \frac{34 percent zinc}{66 percent copper}

= 23.95 g\simeq 24 g

Mass of zinc  =46.5 g copper \times \frac{37 percent zinc}{63 percent copper}

= 27.30 g\simeq 27g

Thus, the range of mass of zinc is 24 g to  27 g





7 0
4 years ago
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