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3 years ago

1. Suppose during volleyball practice, you lost 2.0 lbs of water due to sweating. If all of this

Chemistry

1 answer:

Lynna [10]3 years ago

3 0

Answer:

$E=2052.8 kJ$

Explanation:

The energy absorbed by the water is the energy it requires to evaporate. So:

$Heat of .vap= 40.65 kJ/mol$

The moles of water:

$n_w=m_w *\frac{1000g}{2.2lbs}*\frac{1}{M}$

M is the water molecular weight

$n_w=2 lbs *\frac{1000g}{2.2lbs}*\frac{1}{18g/mol}$

$n_w=50.5mol$

The energy absorbed:

$E=n_w*Heat of vap.=50.5mol *40.65 kJ/mol$

$E=2052.8 kJ$

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Match these items. 1. moles per liter of solution solute 2. spreading out Keq 3. substance being dissolved diffusion 4. general

Degger [83]

Answer:

1. moles per liter of solution - Molarity

2. spreading out - diffusion

3. substance being dissolved- solute

4. general equilibrium constant - Keq

5. the substance doing the dissolving in a solution - solvent

6. solubility product constant - Ksp

Explanation:

Number of moles of substance being dissolved in one liter of solution is defined as molarity

Solute is the substance which is dissolved and solvent is the substance into which the solute is dissolved. For example salt is solute and water is solvent.

Ksp defines the solubility product constant which indicates the equilibrium between a solid and solution and the number of ions of solid required to achieve this equilibrium.

Keq depicts the scenario where reactant and product concentrations are constant in a chemical reaction.

Hence, the correct match is

1. moles per liter of solution - Molarity

2. spreading out - diffusion

3. substance being dissolved- solute

4. general equilibrium constant - Keq

5. the substance doing the dissolving in a solution - solvent

6. solubility product constant - Ksp

8 0

3 years ago

The movement of one or more from one reactant to another is called

mrs_skeptik [129]

Answer: Redox Reaction

Explanation:

Redox reaction is the key chemical events in an oxidation-reduction also called Redox. It is the net movement of electrons from one reactants to another

7 0

3 years ago

Diatomic O2 can react with the element magnesium to form magnesium oxide (MgO). The balanced chemical equation is: 2Mg + O2 → 2M

tigry1 [53]

Answer:

We will expect 4 moles of MgO to be formed (option b).

Explanation:

Step 1: The balanced equation

2Mg + O2 → 2MgO

Step 2: Data given

Number of moles of Magnesium = 4 moles

Oxygen = in excess → this means Magnesium is the limiting reactant

Magnesium will completely be consumed ( 4 moles). There will remain 0 moles.

For 2 moles of magnesium consumed, we need 1 mole of oxygen to produce 2 moles of MgO.

For 4 moles of magnesium, we need 4/2 = 2 moles of oxygen.

For 4 moles of magnesium, we will produce 4/1 = 4 moles of MgO

We will expect 4 moles of MgO to be formed (option b).

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3 years ago

In sublimation which state of matter is absent

Oliga [24]

Liquid :) it goes directly from a solid to a gas. Have a nice day!

5 0

3 years ago

Read 2 more answers

Does Catalysts increase the rate of chemical reactions. true or false

anastassius [24]

True.

A catalyst is a substancr that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.

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3 years ago