Models need to be changed when ______

Nickel carbonyl, Ni(CO)4 is one of the most toxic substances known. The present maximum allowable concentration in laboratory ai

vodomira [7]

<u>Answer:</u> The mass of $Ni(CO)_4$ allowable in the laboratory is 4599.5 grams

<u>Explanation:</u>

To calculate the volume of cuboid, we use the equation:

$V=l\times b\times h$

where,

V = volume of cuboid

l = length of cuboid = 14 ft

b = breadth of cuboid = 22 ft

h = height of cuboid = 9 ft

Putting values in above equation, we get:

$V=14\times 22\times 9=2772ft^3=78503.04L$ (Conversion factor: $1ft^3=28.32L$

To calculate the moles of gas, we use the equation given by ideal gas which follows:

$PV=nRT$

where,

P = pressure of the gas = 1.00 atm

V = Volume of the gas = 78503.04 L

T = Temperature of the gas = $23^oC=[23+273]K=296K$

R = Gas constant = $0.0821\text{ L. atm }mol^{-1}K^{-1}$

n = number of moles of hydrogen gas = ?

Putting values in above equation, we get:

$1.00atm\times 78503.04L=n\times 0.0821\text{ L.atm }mol^{-1}K^{-1}\times 296K\\\\n=\frac{1.00\times 78503.04}{0.0821\times 296}=3230.4mol$

Applying unitary method:

For every 109 moles of gas, the moles of $Ni(CO)_4$ present are 1 moles

So, for 3230.4 moles of gas, the moles of $Ni(CO)_4$ present will be = $\frac{1}{109}\times 3230.4=26.94mol$

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Moles of $Ni(CO)_4$ = 26.94 moles

Molar mass of $Ni(CO)_4$ = 170.73 g/mol

Putting values in above equation, we get:

$26.94mol=\frac{\text{Mass of }Ni(CO)_4}{170.73g/mol}\\\\\text{Mass of }Ni(CO)_4=(26.94mol\times 170.73g/mol)=4599.5g$

Hence, the mass of $Ni(CO)_4$ allowable in the laboratory is 4599.5 grams

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Without consulting Appendix B, arrange each group in order of increasing standard molar entropy (S°). Explain.(a) Glucose (C₆H₁₂

omeli [17]

The increasing order of standard molar entropy (S°) is as follow:

ribose ( C₅H₁₀O₅ ) < Glucose (C₆H₁₂O₆) < sucrose ( C₁₂H₂₂O₁₁ )

<h3>What is Entropy? </h3>

Entropy is defined as the randomness of the particle. It depends on temperature and pressure or number of particle per unit volume.

It is directly proportional to the temperature and pressure of the gas.

<h3>What is Standard Molar Entropy? </h3>

The standard molar entropy is defined as the entropy content of the one mole of pure substance at the standard state of temperature and pressure of interest.

The standard molar entropy is also defined as the total amount of entropy which 1 mole of the substance acquire, as it is brought from 0K to standard conditions of temperature and pressure.

The standard molar entropy depends on the molas mass of atom, molecules or compound.

ribose ( C₅H₁₀O₅ ) has lower standard molar entropy. Due to less complexity of this molecules.

While, complexity increases from Glucose (C₆H₁₂O₆) to sucrose ( C₁₂H₂₂O₁₁ ). Therefore, the standard molar entropy of sucrose ( C₁₂H₂₂O₁₁ ) is greater than Glucose (C₆H₁₂O₆).

Thus, we concluded that the increasing order of standard molar entropy (S°) is as follow:

ribose ( C₅H₁₀O₅ ) < Glucose (C₆H₁₂O₆) < sucrose ( C₁₂H₂₂O₁₁ )

learn more about standard molar entropy:

brainly.com/question/15908262

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1 year ago

Models need to be changed when _______.