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3 years ago

In what ways are final grade calculations and atomic mass calculations similar?

Chemistry

1 answer:

Gennadij [26K]3 years ago

3 0

Answer:

atomic mass calculations are similar to final grade calculations in how the two are calculated. In school, your given different kinds of work that has a different effect on your grade. Homework might be worth 20 percent while a tests are worth 80 percent. the percentage of these assignments are the weight they have on your grade. when you multiply the weight by the score, you get a weighted score that you can add with other weighted scores to reach a total, that total would be your grade. Atomic mass calculations are found the same way, first turn the percent abundance into a decimal (divide by 100, 97% becomes .97) multiply it by Mass (AMU) and you get that isotopes mass contribution. do this for the isotopes for whatever element, and add up the total. the total will be your element's atomic mass.

Explanation:

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A self-contained underwater breathing apparatus (SCUBA) uses canisters containing potassium superoxide. The superoxide consumes

emmainna [20.7K]

Answer:

52.0004 grams of mass of potassium superoxide is required

Explanation:

Let moles carbon dioxide gas be n at 22.0 °C and 767 mm Hg occupying 8.90 L of volume.

Pressure of the gas,P = 767 mm Hg = 0.9971 atm

Temperature of the gas,T = 22.0 °C = 295.15 K

Using an ideal gas equation to calculate the number of moles.

$PV=nRT$

$n=\frac{0.9971 atm\times 8.90 L}{0.0821 atm L/mol K\times 295.15 K}$

n = 0.3662 mol

$4KO_2(s)+2CO_2(g)\rightarrow 2K_2CO_3(s)+3O_2(g)$

According to reaction, 2 moles of carbon-dioxide reacts with 4 moles of potassium superoxide.

Then 0.3662 mol of of carbon-dioxide will react with:

$\frac{4}{2}\times 0.3662 mol=0.7324 mol$ of potassium superoxide.

Mass of 0.7324 mol potassium superoxide:

0.7324 mol × 71 g/mol = 52.0004 g

52.0004 grams of mass of potassium superoxide is required.

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3 years ago

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Answer:

Explanation:

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Coefficient in a sentence? In chemistry

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Answer:

Arrhenius has pointed out that the coefficient of affinity of an acid is proportional to its electrolytic ionization.

Explanation:

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maxonik [38]

Your answer would be C because the fire gave the marshmellow a brown crust shwoing effect.

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2. How did the Activator affect the mixture?

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Answer:

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Explanation:

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