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3 years ago

How do you measure moles

Chemistry

2 answers:

wlad13 [49]3 years ago

6 0

Answer:

Answers may vary

Explanation:

Mol is the amount of molecules in something. Mol are similar to donuts, if you have a dozen of something you have 12 of them. If you have a mol of Hydrogen gas you 6.02•10^23 molecules of Hydrogen gas. If you are taking a chemistry class you will probably receive questions involving converting grams to mol and vice versa.

Converting Grams to Mol:

grams of x•(1/molecular mass of x)

note: you can find molecular mass of x by looking at the masses of the elements you need to add up in the periodic table

Converting Mol to Grams:

mol of x•(molecular mass of x)

Mekhanik [1.2K]3 years ago

4 0

Mole is the SI unit of measurement used to measure the number of things, usually atoms or molecules. One mole of something is equal to 6.02214078×1023 of same things (Avogadro's number). For example, one mole of grapes is 6.02214078×1023 grapes.

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On a cool, rainy day, the barometric pressure is 746 mmHg. Calculate the barometric pressure in centimeters of water (cmH2O) (d

docker41 [41]

Answer:

100.71 cm H2O

Explanation:

In a fluid column barometer, the height of the fluid column is proportional to the pressure. The pressure is by definition:

$P=\frac{F}{A}$ , where F is a force and A is the area.

In a column barometer the force is given by the weight of the fluid:

$F=m*g$ , and the mass may be expressed as $m=p*V$ , where $p$ is the density and V is the volume.

Replacing this in the pressure definition:

$P=\frac{pVg}{A}$

In a constant cross section area column, the volume may be calculated as:

$V=A*h$ where A is the area and h the height. Replacing this in the previous equation:

$P=\frac{pAhg}{A}=pgh$

Different columns may be over the same pressure, so:

$P_{w}=P_{Hg}\\ p_{w}h_{w}g=p_{Hg}h_{Hg}g\\$

Dividing each part for gravity constant:

$p_{w}h_{w}=p_{Hg}h_{Hg}$

And isolating hw:

$h_{w}=\frac{p_{Hg}h_{Hg}}{p_{w} } \\h_{w}=\frac{13.5*746}{1.00}=10071$ mm

It is equal to 1007,1 cm.

7 0

3 years ago

Which reaction occurs when equivalent quantities of H" (or H30) and OH" are mixed?

Lynna [10]

Answer: A reaction which occurs when equivalent quantities of H" (or $H_{3}O^{+}$ ) and OH" are mixed is a neutralization reaction.

Explanation:

When acid and base chemically combine together to form sat and water then it is know as neutralization reaction.

An acidic substance gives hydrogen ions $(H^{+})$ on dissociation and a basic substance gives hydroxide ions $(OH^{-})$ on dissociation.

For example, $H^{+} + OH^{-} \rightarrow H_{2}O$ is a neutralization reaction where an acid and base are mixed together to form water.

No salt is formed as because here the reactants are not present as compounds.

In a hydrolysis reaction, water molecule(s) is added to the reactant molecules.

For example, $CH_{3}COOCH_{3} + H_2O \rightarrow CH_{3}COOH + CH_{3}OH$

Oxidation is the process of addition of oxygen to a molecule and removal of hydrogen.

Reduction is the process of addition of hydrogen in a compound and the removal of oxygen atom.

Therefore, we can conclude that reaction which occurs when equivalent quantities of H" (or $H_{3}O^{+}$ ) and OH" are mixed is a neutralization reaction.

4 0

3 years ago

What does this represent about the type of change

nasty-shy [4]

Answer:

<h3>A) a chemical change started immediately and finished at 8 minutes!!</h3>

Explanation:

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4 years ago

P4 +6Br2 --> 4PBr3

grin007 [14]

Answer:

1 mole of P₄ consumed:4 moles of PBr₃ produced

Explanation:

Look at the coefficients in the balanced chemical equation to determine the ratios. For every 1 mole of P₄ consumed (P₄ has a coefficient of 1), 4 moles of PBr₃ would be produced (PBr₃ has a coefficient of 4).

6 0

3 years ago

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Whether a material is magnetic or not depends on what

Inessa05 [86]

It depends on what the material is.

3 0

3 years ago