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3 years ago

10

How much heat energy is required to raise the temperature of 20 kilograms of water from 0°C to 35°C?

1 answer:

alexgriva [62]3 years ago

7 0

The heat energy needed is 2928800J. Mass is given as 20 (kg)

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What happened to the salt molecules when they were added to cold water

Nimfa-mama [501]

Cooler water molecules are denser than warm water and will not allow much of the salt to dissolve

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He generic metal a forms an insoluble salt ab(s) and a complex ac5(aq). the equilibrium concentrations in a solution of ac5 were

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Balanced chemical reaction: A + 5C ⇄ AC₅.
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3 years ago

The solubility of oxygen gas in water at 40 ∘c is 1.0 mmol/l of solution. What is this concentration in units of mole fraction?

juin [17]

The formula for mole fraction is:

$mole fraction of solute = \frac{number of moles of solute}{total number of moles of solution}$ -(1)

The solubility of oxygen gas = 1.0 mmol/L (given)

1.0 mmol/L means 1.0 mmol are present in 1 L.

Converting mmol to mol:

$1.00 mmol\times \frac{1 mol}{1000 mmol} = 0.001 mol$

So, moles of oxygen = 0.001 mol

For moles of water:

1 L of water = 1000 mL of water

Since, the density of water is 1.0 g/mL.

$Density = \frac{mass}{volume}$

$Mass = 1.0 g/ml\times 1000 mL = 1000 g$

So, the mass of water is 1000 g.

Molar mass of water = 18 g/mol.

Number of moles of water = $\frac{1000 g}{18 g/mol} = 55.55 mol$

Substituting the values in formula (1):

$mole fraction = \frac{0.001}{55.55+0.001}$

$mole fraction = 1.8\times 10^{-5}$

Hence, the mole fraction is $1.8\times 10^{-5}$ .

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3 years ago

Silvers symbol on the periodic table of the elements is Ag. what else is true of silver?

pishuonlain [190]

The answer should be D hope this helps

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