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2 years ago

If 86. 33 grams of sodium reacts with an excess of chlorine, what amount of

Chemistry

1 answer:

UkoKoshka [18]2 years ago

7 0

Answer:

the ans

Explanation:

Sodium + chlorine → sodium chloride

The balanced chemical equation:

2Na + Cl2 → 2NaCl

According to the equation above: n(Na) = n(NaCl)

Moles of Na = Mass of Na / Molar mass of Na

The molar mass of Na is 22.9898 g mol-1.

Hence,

n(Na) = 86.33 g / 22.9898 g mol-1 = 3.755 mol

n(NaCl) = n(Na) = 3.755 mol

Moles of NaCl = Mass of NaCl / Molar mass of NaCl

Mass of NaCl = Moles of NaCl × Molar mass of NaCl

The molar mass of NaCl is 58.44 g mol-1.

Hence,

m(NaCl) = 3.755 mol × 58.44 g mol-1 = 219.44 g

m(NaCl) = 219.44 g

OR:

(86.33 g Na)×(1 mol Na/22.9898 g Na)×(2 mol NaCl/2 mol Na)×(58.44 g NaCl/1 mol NaCl) = 219.45 g

Answer: 219.44 grams (or 3.755 mol) of sodium chloride (NaCl) will be produced.

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If a 1.45 M solution has 2.43 g HCl dissolved, what is the volume of solution? (Change g HCl into mol using molar mass)

Ulleksa [173]

Answer: The volume of solution is 0.0459 L

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution

$Molarity=\frac{n}{V_s}$

where,

n = moles of solute

$V_s$ = volume of solution in L

moles of HCl (solute) = $\frac{\text {given mass}}{\text {Molar mass}}=\frac{2.43g}{36.5g/mol}=0.0666$

Now put all the given values in the formula of molality, we get

$1.45M=\frac{0.0666}{V_s}$

$V_s=\frac{0.0666}{1.45}=0.0459$

Therefore, the volume of solution is 0.0459 L

5 0

3 years ago

Theoretical yield: 35.0g Actual yield: 27.7g What is the percent yield?

maksim [4K]

Answer:

Percentage yield=79.14%

Explanation:

Percentage yield=(Actual yield/theoretical yield)*100

Percentage yield=27.7g/35.0g*100

Percentage yield=79.14%

4 0

2 years ago

The knowledge produced by science builds on old ideas and is constantly changing.

VikaD [51]

Yes it is always changing, as time moves on new technological advancements are made. This makes it possible for new ideas to be created. For example the depiction of an atom went through many stages throughout the years in order to find out our current final version. New scientists and new ideas can add on to older ones, making explanations that make more scientific sense.

6 0

3 years ago

URGENT! A solution that contains less solute than it can possibly hold at a given temperature.

Zigmanuir [339]

Answer:

Diluted solution

Explanation:

It is simple in terms of looking in to it, solute is the solid part of the solution and if a small quantity is dissolved in a solvent which can hold more then the solute added will make the solution diluted and for more info- other answers depict that there is more solute in the solution therefore others can not be the answer

4 0

3 years ago

An unknown compound is discovered in a raid on a terrorist organization; it is believed that the compound is Sarin. When a 10.0-

Eduardwww [97]

Given:

Mass of the unknown compound (believed to be Sarin) = 10.0 g

Mass of CO2 produced = 15.6 g

Mass of H2O produced = 6.4 g

To determine:

If the unknown compound is Sarin

Explanation:

The molecular formula for Sarin is: C₄H₁₀FO₂P

Based on stoichiometry the C:H ratio = 4:10 i.e 2:5

Now, from the combustion data:

# moles of CO2 produced = # moles of C present in the unknown sample

Similarly, (# moles of H2O produced)*2 = # moles of H present in the unknown sample

# moles of CO2 = 15.6 g/44 g.mol-1 = 0.354 moles

# moles of H2O = (6.4 g/ 18 g.mol-1 )* 2 = 0.711 moles

The C:H ratio = 0.354 : 0.711 = 1:2

Ans: Since the C:H ratio does not match the actual stoichiometry based on the molecular formula, the unknown compound is not Sarin.

4 0

3 years ago