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2 years ago

HELP 20 points!

Chemistry

1 answer:

monitta2 years ago

5 0

Answer:

The limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops. ... The limiting reagent is the one that is totally consumed; it limits the reaction from continuing because there is none left to react with the in-excess reactant.

Explanation:

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What is the molality of an aqueous KCl solution with a mole fraction of KCl, XKCl = 0.175? (The molar mass of KCl = 74.55 g/mol

NARA [144]

Answer:

The molality of the KCl solution is 11.8 molal

Explanation:

Step 1: Data given

Mol fracrion KCl = 0.175

Molar mass KCl = 74.55 g/mol

Molar mass H2O = 18.02 g/mol

Step 2: Calculate mol fraction H2O

mol fraction H2O = 1 - 0.175 = 0.825

Step 3: Calulate mass of H2O

Suppose the total moles = 1.0 mol

Mass H2O = moles H2O * molar mass

Mass H2O = 0.825 * 18.02 g/mol

Mass H2O = 14.87 grams = 0.01487 kg

Step 4: Calculate molality

Molality KCl = 0.175 / 0.01487 kg

Molality KCl = 11.8 molal

The molality of the KCl solution is 11.8 molal

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3 years ago

We can change a gas to liquid by_________ the temperature and_________

Tpy6a [65]

Decreasing, Removing

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3 years ago

In order to study hydrogen halide decomposition, a researcher fills an evacuated 1.11 L flask with 0.822 mol of HI gas and allow

Elza [17]

Answer:

Kc = 168.0749

Explanation:

2HI(g) ↔ H2(g) + I2(g)

initial mol: 0.822 0 0

equil. mol: 2(0.822 - x) x x

∴ [ HI ]eq = 0.055 mol/L = 2(0.822 - x) / (1.11 L )

⇒ 1.644 - 2x = 0.055 * 1.11

⇒ 1.644 = 2x + 0.06105

⇒ 2x = 1.583

⇒ x = 0.7915 mol equilibrium

⇒ [ H2 ] eq = 0.7915mol / 1.11L = 0.7130 M = [ I2 ] eq

⇒ Kc = ([ H2 ] * [ I2 ]) / [ HI ]²

⇒ Kc = ( 0.7130² ) / ( 0.055² )

⇒ Kc = 168.0749

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3 years ago

Brainiest The Alpine Marmot is a kind of large ground squirrel that lives in the mountains and eats grasses, herbs, grains and s

Ghella [55]

It's the second one. Their body activity decreases, mostly because they're sleeping and they conserve the food in their bodies for long periods of time.
<span>the marmots' body activity decreases to conserve food stored in their bodies.</span>

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3 years ago

Read 2 more answers

How many moles are in 1.51 x 10^24 molecules of water?

lyudmila [28]

Answer:One mole of HBr has 6.02 x 1

molecules of HBr.

1 mole of HBr = 6.02 x 1

molecules of HBr.-----(a)

X mole of HBr has 1.21 x

molecules of HBr.

X mole of HBr = 1.21 x

molecules of HBr------(b)

Taking ratio of (a) and (b)

X / 1 = 1.21 x

/ 6.02 x 1

X= 2.009 moles.

Explanation:

3 0

3 years ago