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3 years ago

1.50μm2. Convert this to square meters.

1 answer:

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 μm2 = 1.5 x (10^-6)^2 = 1.5 x 10^-12 meter sqaures

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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

MaRussiya [10]

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 given mass of product formed. We convert the 12 grams of chlorine to moles, using its molar mass:

12 g ÷ 70.906 g/mol = 0.169 mol

Then we convert Cl₂ moles to H₂O moles:

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

Finally we convert moles to grams:

0.169 mol H₂O * 18 g/mol = 3.05 g

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3 years ago

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The answer is C. statement of owner's equity

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Juliette [100K]

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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:

a) The second law of thermodynamics states that the entropy of the universe increases in a spon taneous process and remains unchanged in an equilibrium process.

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) A reaction that does occur under the given set of conditions is called a 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.

• A lump of sugar spontaneously dissolves in a cup of coffee, but dissolved sugar does not spontaneously reappear in its original form.

• Heat flows from a hotter object to a colder one, but the reverse never happens spontaneously.

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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 = $185 g yellow zinc \times \frac{34 zinc}{100 yellow zinc}$