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2 years ago

SEP Use Mathematics Review the calculation for the atomic mass of carbon,

1 answer:

3 0

The atomic mass rounded to the thousandths place, rather than expressed to the ten-thousandths place because the ten-thousandth digit is insignificant.

<h3>What is atomic mass?</h3>

The atomic mass of an atom is the quantity of matter contained in an atom of an element.

<h3>Unit of measurement of atomic mass of atoms</h3>

Atomic mass is measured in units of "amu" also called daltons.

1 amu = 1.66 x 10⁻²⁴ g

The atomic mass of the carbon given as 12.011 amu rounded to the thousandths place is calculated as follows;

nearest thousandths place = 3 decimal places

12.011 amu = 12.011 amu

Thus, the atomic mass rounded to the thousandths place, rather than expressed to the ten-thousandths place because the ten-thousandth digit is insignificant.

Learn more about atomic mass here: brainly.com/question/3187640

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Tarnish on tin is the compound SnO. A tarnished tin plate is placed in an aluminum pan of boiling water. When enough salt is add

natulia [17]

Answer:

1.52V

Explanation:

Oxidation half equation:

2Al(s)−→2Al^3+(aq) + 6e

Reduction half equation

3Sn2^+(aq) + 6e−→3Sn(s)

E°cell= E°cathode - E°anode

E°cathode= −0.140 V

E°anode= −1.66 V

E°cell=-0.140-(-1.66)

E°cell= 1.52V

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4 years ago

Write the Lewis structure for the product that forms when boron trifluoride combines with ammonia. Remember to show all non-zero

horrorfan [7]

Answer:

To draw or sketch a Lewis structure, formula or diagram, the chemical formula of the compound is essential. Without it you can not even know what are the atoms that make it up, in our case it is the one observed in the reaction shown:

$BF_{3}$ + $:NH_{3}$ ⇒ F3 $F_{3} BNH_{3}$

In the structure obtained (see the Lewis structure in the drawing) the black dots correspond to the electrons of the non-shared pairs. Because hydrogen has a single electron and a single orbital available to fill, it forms only a covalent bond represented by a long dash. The same goes for boron and fluorine but in this case the fluorine has pairs of free electrons.

Explanation:

Lewis's structure is all that representation of covalent bonds within a molecule or an ion. In it, said bonds and electrons are represented by long dots or dashes, although most of the times the dots correspond to non-shared electrons and dashes to covalent bonds.

All existing compounds can be represented by Lewis structures, giving a first approximation of how the molecule or ions could be.

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3 years ago

What is the percent yield if 0.3 mol ba(no3)2 and 0.25 mol na3po4 react to produce 0.095 mol ba3(po4)2?

Lyrx [107]

The chemical reaction is expressed as:

3Ba(NO3)2 + 2Na3PO4 = Ba3(PO4)2 + 6NaNO3

To determine the percent yield, we need to determine the theoretical yield of the reaction from the given amounts of the reactants. We do as follows:

0.3 mol 3Ba(NO3)2 ( 2 mol Na3PO4 / 3 mol Ba(NO3)2) = 0.2 mol Na3PO4

Therefore, the limiting reactant would be Ba(NO3)2 since it is consumed completely in the reaction.

Theoretical yield = 0.3 mol 3Ba(NO3)2 ( 1 mol Ba3(PO4)2 / 3 mol Ba(NO3)2) = 0.1 mol Ba3(PO4)2

Percent yield = actual yield / theoretical yield = 0.095 mol Ba3(PO4)2 / 0.1 mol Ba3(PO4)2 x 100 = 95%

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3 years ago

If acid spills on your shoulder, you should use the

kozerog [31]

Answer:

If you spill an acid or base on your shoulder immediately wash well with water. Strong bases react with the oils in your shoulder to produce a soapy feeling layer. Rinse until well after that feeling is gone. Do not attempt to neutralize a spill on your skin.

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3 years ago

Read 2 more answers

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shtirl [24]

Answer:

how can I know

Explanation:

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3 years ago