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4 years ago

Why does a catalyst work for a long time before it needs replacing?

1 answer:

7 0

Because the catalyst is not really part of the reaction. it is something that speed up a reaction by lowering the energy need for the reaction to take place. however, in the end the catalyst is brought back to its initial state. that's why it is long lasting

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Which element in the periodic table has the greatest electronegativity?

KengaRu [80]

F (Fluorine) has the highest electronegativity with a value of 4.0

7 0

3 years ago

a 2000ml bottle has a mass of 234g when empty and a mass of 2367g when full of pop. how dense is the pop that is in the bottle

stich3 [128]

Answer:

density = mass/volume sub the values

5 0

3 years ago

What amount of acid is esterified if a mixture consist initially of 1.0mole of ethanoic acid,1.0mole of ethanol and 1.0mole of w

ale4655 [162]

Answer:

0.54 mole

Explanation:

CH3COOH CH3CH2OH CH3COOCH2CH3 H2O

Initial concentration 1.0 mole 1.0 mole 0 mole 1.0mol

Change - x - x + x + x

Equilibrium (1.0 - x) (1.0 - x) x (1.0 + x)

K = [CH3COOCH2CH3]*[H2O]/[CH3COOH]*[CH3CH2OH]

x*(1.0+x)/(1.0-x)(1.0-x) = 4.0

x+x²=4*(1-x)²

x+x² = 4(1² - 2x + x²)

x + x² = 4 - 8x + 4x²

4 - 8x + 4x²- x² - x= 0

3x² - 9x + 4 = 0

x=2.5 , x=0.54

2.5 mole of acid cannot be esterified, because there is only 1.0 mole of acid,

so answer is 0.54 mole.

3 0

4 years ago

What is the temperature of 0. 750 mol of a gas stored in a 6,850 ml cylinder at 2. 21 atm?.

victus00 [196]

-246 K-

________________

3 0

2 years ago

An aqueous solution was created by placing 0.018 g of NaCl into a 50 mL volumetric flask and diluting to volume with deionized w

Burka [1]

Answer:

Molarity: 6.2x10⁻³M NaCl

Molality: 6.2x10⁻³m NaCl

Mole Fraction: 1.1x10⁻⁴

Mass% NaCl: 0.036% (m/m NaCl)

Explanation:

<em>Molarity -Moles NaCl / L-</em>

<em>Moles NaCl -Molar mass: 58.44g/mol-</em>

0.018g * (1mol/58.44g) = <em>0.000308 moles NaCl</em>

<em>Liters water:</em>

50mL * (1L/1000mL) = <em>0.050L</em>

M = 0.000308 moles NaCl / 0.050L

<em>Molality -Moles NaCl / kg water-</em>

<em>Moles NaCl = 0.000308 moles NaCl</em>

<em>kg water = 50mL * (1g/mL) * (1kg/1000g) = 0.050kg</em>

m = 0.000308 moles NaCl / 0.050kg

<em>Mole Fraction -Moles NaCl / Moles water+ Moles NaCl-</em>

<em>Moles water = 50g * (1mol/18.01g) = 2.776 moles</em>

Moles fraction = 0.000308 moles NaCl / 0.000308 moles NaCl + 2.776moles water

<h3>Mole fraction = 1.1x10⁻⁴</h3><h3 />

<em>Mass Percent -Mass NaCl / Mass NaCl+Mass Water * 100</em>

0.018g / 50g+0.018g * 100

<em />

8 0

3 years ago