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kolezko [41]
3 years ago
11

Can you please help me it is urgent! A student is given a sample of an unknown liquid to test in the laboratory. The student thi

nks that the liquid is water. Which of the following properties of the sample is most helpful to determine if the liquid is water?
(A) color of the liquid

(B) mass of the liquid

(C) the volume of the liquid

(D) the boiling point of the liquid
Chemistry
2 answers:
Evgen [1.6K]3 years ago
4 0

Answer:boiling point of the liquid.

Explanation:

swat323 years ago
3 0

Answer:

The answer is Boling Point

Explanation:

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If the reaction of 3.50 moles of lithium with excess hydrofluoric acid produced a 75.5% yield of hydrogen gas, what was the actu
melomori [17]

<u>Answer: </u>The correct answer is 1.32 mol H_2

<u>Explanation:</u>

For the reaction of lithium and hydrofluoric acid, the equation follows:

2Li+2HF\rightarrow 2LiF+H_2

By Stoichiometry of the reaction:

if 2 moles of lithium is producing 1 mole of hydrogen gas,

Then, 3.50 moles of lithium will produce = \frac{1}{2}\times 3.5=1.75mol of hydrogen gas.

  • Now, to know the theoretical yield of hydrogen gas, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}   ...(1)

Moles of hydrogen gas = 1.75 mol

Molar mass of hydrogen gas = 2 g/mol

Putting values in above equation, we get:

1.75mol=\frac{\text{Mass of hydrogen gas}}{2g/mol}\\\\\text{Given mass of hydrogen gas}=3.5gl

  • To calculate the percentage yield, we use the equation:

\%\text{ yield}=\frac{\text{Actual yield}}{\text{Theoretical yield}}\times 100

Percentage yield = 75.5 %

Theoretical yield = 3.5 g

Putting values in above equation, we get:

75.5=\frac{\text{actual yield}}{3.5g}\times 100\\\\\text{Actual yield}=2.64g

  • Now, calculating the moles of hydrogen gas, we put the value in equation 1, we get:

\text{Moles of hydrogen gas produced}=\frac{2.64g}{2g/mol}=1.32mol

Hence, the correct answer is 1.32 mol H_2

5 0
3 years ago
Read 2 more answers
Ferris &amp; Mona used the ORP sensor to titrate a ferrous ammonium sulfate solution, (NH4)2Fe(SO4)2 with KMnO4 titrant.
DIA [1.3K]

Answer:

The correct option is: A. 0.168 M

Explanation:

Chemical reaction involved:

5 Fe²⁺ (aq) + MnO₄⁻ (aq) + 8 H⁺ (aq) → 5 Fe³⁺ (aq) + Mn²⁺ (aq) + 4 H₂O

Given: <u>For MnO₄⁻ solution</u>-

Number of moles: n₁ = 1, Volume: V₁ = 20.2 mL, Concentration: M₁ = 0.0250 M;

<u>For Fe²⁺ solution</u>:

Number of moles: n₂ = 5, Volume: V₂ = 15 mL, Concentration: M₂ = ?M

<u><em>To find out the concentration of Fe²⁺ solution (M₂), we use the equation:</em></u>

\frac{M_{1}\times V_{1}}{n_{1}} = \frac{M_{2}\times V_{2}}{n_{2}}

\frac{0.0250 M\times 20.2 mL}{1} = \frac{M_{2}\times 15 mL}{5}

0.505 = M_{2}\times 3

M_{2} = \frac{0.505}{3} = 0.168M

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Is the oxygen you breathe brand new
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Yes because every plant around you keeps giving new oxygen.

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If the mass of a certain block is 500g, what is the weight of the block?
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