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3 years ago

12

(True or False) It would be most appropriate to use the noble gas core [He] when writing the shorthand electron configuration fo

r sulfur.

2 answers:

wel3 years ago

8 0

No it should be Ne as it is its closest noble gas.

slamgirl [31]3 years ago

7 0

The answer is false.<span />

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How do the differences in the polyatomic ions po3 3- and po4 3- help you determine whether each ends in -ite or -ate?

Tcecarenko [31]

There is a rule in naming polyatomic anions containing oxygen. Those names ending in <em>–ate</em> are given to the most common oxyanion of an element. While those names ending in <em>–ite</em> are for those that contains fewer O atom for the same charge. Since P $PO_{3} ^{3-}$ has fewer O atoms, its name ends in <em>–ite</em>. Thus, P $PO_{3} ^{3-}$ is phosphite while P $PO_{4} ^{3-}$ is phosphate.

4 0

3 years ago

Sodium metal and water react to create sodium hydrogen and hydrogen gas through the unbalanced equation.

Maurinko [17]

Answer:

Theoretical yield = 2.5 g

Explanation:

Given data:

Mass of sodium = 79.7 g

Mass of water = 45.3 g

Theoretical yield of hydrogen gas = ?

Solution:

Chemical equation:

2Na + 2H₂O → 2NaOH + H₂

Number of moles of sodium:

Number of moles = mass/ molar mass

Number of moles = 79.7 g / 23 g/mol

Number of moles = 3.5 mol

Number of moles of water:

Number of moles = mass/ molar mass

Number of moles = 45.3 g / 18g/mol

Number of moles = 2.5 mol

Now we will compare the moles of hydrogen gas with water and sodium.

H₂O : H₂

2 : 1

2.5 : 1/2×2.5 =1.25 mol

Na : H₂

2 : 1

3.5 : 1/2×3.5 =1.75 mol

water will be limiting reactant.

Theoretical yield:

Mass = number of moles × molar mass

Mass = 1.25 mol × 2 g/mol

Mass = 2.5 g

8 0

3 years ago

62 grams of Zn(C2H3O2)4 are dissolved to make a 1.5 M solution. How many milliliters of water are needed?

LenKa [72]

Molarmass of <span>Zn(C2H3O2)4 is 301.5561 g/mol

moles of </span>
<span>Zn(C2H3O2)4
= 62 g * 1 mol/(</span><span>301.5561 g) = 0.2056 mol

concentration = moles / volume
concentration * volume = moles
volume = moles / concentration
volume = 0.2056 mol / 1.5 M
volume = 0.13706 L
volume = 137 mL
volume = 140 mL
</span>

3 0

4 years ago

Read 2 more answers

How many grams of sodium formate, NaCHO2, would have to be dissolved in 3.0 L of 0.12 M formic acid (pKa 3.74) to make the solut

kolbaska11 [484]

Answer:

$Mass_{sodium\ formate}= 889.57\ g$

Explanation:

Considering the Henderson- Hasselbalch equation for the calculation of the pH of the acidic buffer solution as:

$pH=pK_a+log\frac{[salt]}{[acid]}$

Given that:-

[Acid] = 0.12 M

Volume = 3.0 L

pKa = 3.74

pH = 5.30

So,

$5.30=3.74+log\frac{[sodium\ formate]}{0.12}$

Solving, we get that:-

[Sodium formate] = 4.36 M

Considering:

$Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}$

So,

$Moles =Molarity \times {Volume\ of\ the\ solution}$

So, Moles of sodium formate = 4.36*3.0 moles = 13.08 moles

Molar mass of sodium formate = 68.01 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$13.08\ mole= \frac{Mass}{68.01\ g/mol}$

$Mass_{sodium\ formate}= 889.57\ g$

5 0

4 years ago

How can something be considered abiotic and biotic

Darina [25.2K]

Biotic Resources are based on living organisms. These are obtained from the biosphere. Examples are animals, birds, forests. They can reproduce themselves!

Abiotic Resourcesare based on non-living organisms. They are obtained from lithosphere, atmosphere and hydrosphare. Examples are water, air, minerals. They cannot reproduce themselves.

5 0

3 years ago

Read 2 more answers