Which of the following is a source of graywater? s

Bromine has two naturally occurring isotopes (br-79 and br-81) and has an atomic mass of

Rzqust [24]

Answer: 78.919 amu

Explanation:

If the natural abundance of Br-81 is 49.310%, then the natural abundance of Br-79 must be 100%-49.310%=50.690%

Substituting into the atomic mass formula,

$79.904=(0.49310)(80.9163)+(0.50690)(x)\\79.904=39.89982753+(0.50690)(x)\\40.00417247=(0.50690)(x)\\x=\frac{40.00417247}{0.50690}=\boxed{78.919 \text{ amu}}$

5 0

2 years ago

How many grams of H2O will be produced if 750. grams of Fe are produced?

aleksandr82 [10.1K]

Answer:

$\boxed{\small \sf \: Mass \: of \: H_2O =322.2 \: grams}$

Explanation:

Given:

Mass of ferous (Fe) produced = 750 gram.

To find:

Mass of water produced= ?

Solution:

Molar mass of Fe is 55.84 gram/mol

Let's find out the number of moles of ferous produced.

$\small \sf Number \: of \: moles = \frac{Given \: mass \: of \: substance }{Molar \: mass \: of \: substance}$

Substituting the given data in above formula.

$\small \sf Number \: of \: moles = \frac{750}{55.84}$

$\boxed{\small \sf Number \: of \: moles \: of \: Fe= 13.43 \: moles}$

Now the given reaction is,

$Fe_3O_4 + 4H_2 \rightarrow 3Fe + 4H_2O$

For every 3 mole of production of Fe, 4 mole of waters are produced.
let for 13.43 moles of Fe x moles of H2O will be produced.

now calculate the number of moles of H2O

$\sf \: \frac{3}{4} = \frac{13.43}{x} \\ \sf x = \frac{13.43 \times 4}{3} \\ \sf x = 17.90 \: moles$

$\small \boxed{\sf number \: of \: moles \: of \: H_2O= 17.90 \: moles}$

mass of one mole of H2O is 18 gram, so we can calculate mass of 17.90 moles.

$\small \sf \: Mass \: of \: H_2O = 17.90 \times 18 \\ \boxed{\small \sf \: Mass \: of \: H_2O =322.2 \: grams}$

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3 0

2 years ago

Which of the following is a form of mechanical energy?

11Alexandr11 [23.1K]

Answer:

thermal energy

Explanation:

due to the heat

3 0

3 years ago

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During an experiment, the percent yield of calcium chloride from a reaction was 80.34%. Theoretically, the expected amount shoul

FinnZ [79.3K]

Answer:

The actual yield from this reaction is 92.39 grams CaCl2

Explanation:

Step 1: Data given

% yield = 80.34 %

Expected amount of Calcium chloride (CaCl2) = 115 grams

Step 2: The balance equation

CaCO3 + 2HCl → CaCl2 + CO2 + H2O

Step 3: Calculate actual yield

% yield = 80.34 % = 0.8034 = actual yield / theoretical yield

actual yield = 0.8034 * 115.0 grams

actual yield = 92.39 grams

The actual yield from this reaction is 92.39 grams CaCl2

6 0

3 years ago

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Briefly define weather,season and Climate.

inn [45]

Answer:

this is an answer to your question in explanation

Explanation:

Weather is the atmospheric conditions, including the temperature, wind, snow, rain, or anything else happening outside

season is one of the four division in a calendar year

Climate is the longstanding average weather of an area.

4 0

3 years ago

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