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love history [14]
4 years ago
8

C4H8(g)⟶2C2H4(g) C4H8(g)⟶2C2H4(g) has an activation energy of 262 kJ/mol.262 kJ/mol. At 600.0 K,600.0 K, the rate constant, ????

,k, is 6.1×10−8 s−1.6.1×10−8 s−1. What is the value of the rate constant at 725.0 K?
Chemistry
1 answer:
Yanka [14]4 years ago
7 0

Answer:

Rate constant at 725 K is 5.2\times 10^{-4}s^{-1}

Explanation:

According to Arrhenius equation for a reaction-

ln(\frac{k_{2}}{k_{1}})=\frac{E_{a}}{R}(\frac{1}{T_{1}}-\frac{1}{T_{2}})

where k_{2} and k_{1} are rate constants of reaction at T_{2} and T_{1} temperatures (in kelvin) respectively.

E_{a} is activation energy of reaction.

Here T_{1}= 600 K , k_{1}= 6.1\times 10^{-8}s^{-1}

T_{2}= 725 K, E_{a}= 262 kJ/mol and R = 8.314 J/(mol.K)

So plugin all the values in the above equation-

ln(\frac{k_{2}}{6.1\times 10^{-8}s^{-1}})=\frac{262\times 10^{3}J/mol}{8.314J/(mol.K)}\times (\frac{1}{600K}-\frac{1}{725K})

So, k_{2} = 5.2\times 10^{-4}s^{-1}

Hence rate constant at 725 K is 5.2\times 10^{-4}s^{-1}

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Imagine that the apparent weight of the crown in water is <img src="https://tex.z-dn.net/?f=W_%7Bapparent%7D" id="TexFormula1" t
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Answer : The crown is not made of pure (100%) gold.

Explanation :

Formula used :

\frac{W_{apparent}}{W_{actual}}=1-\frac{\rho_w}{\rho_c}

where,

W_{apparent} = apparent weight of the crown in water = 4.50 N

W_{actual} = actual weight = 5.00 N

\rho_w = density of water = 1.00g/cm^3

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Now put all the given values in the above formula, we get:

\frac{4.50N}{5.00N}=1-\frac{1.00g/cm^3}{\rho_c}

\rho_c=10g/cm^3

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5 0
4 years ago
Does water have mass? Yes or no. Thanks everyone for your help
Mice21 [21]

Answer: The density of a material is defined as its mass per unit volume. In this example, each volume of water is different and therefore has a specific and unique mass. The mass of water is expressed in grams (g) or kilograms (kg), and the volume is measured in liters (L), cubic centimeters (cm3), or milliliters (mL).

Explanation: HOPE IT HELPS :)

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3 years ago
A dunk tank hold 30,533 moles of water? How many grams of water are in the tank?
liubo4ka [24]

The mass of water in the tank, given the data from the question is 549594 g

<h3> Description of mole </h3>

The mole of a substance is related to it's mass and molar mass according to the following equation:

Mole = mass / molar mass

<h3>How to determine the mass of water in the tank</h3>

From the question given above, the following data were obtained:

  • Mole of water = 30533 moles
  • Molar mass of water = 18 g/mol
  • Mass of water = ?

The mass of the water can be obtained as follow:

Mass = mole × molar mass

Mass of water = 30533 × 18

Mass of water = 549594 g

Learn more about mole:

brainly.com/question/13314627

#SPJ1

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Will salivary amylase work in the stomach?​
lions [1.4K]

Answer:

Typically the pH in the stomach is around 1.0 to 2.0, which is extremely acidic. This level of acidity causes salivary amylase's protein structure to denature and change shape. Consequently, salivary amylase does not function once it enters the stomach.

Explanation:

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