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allochka39001 [22]

3 years ago

9

Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas

are formed when 48.7 grams of sodium are added to water?

1 answer:

zysi [14]3 years ago

5 0

Convert the 48.7 grams into moles and then use the balanced equation to convert to moles of hydrogen gas. Then divide by avogadro's number<span />

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Answer:

3.6 micrograms answers (c)

Explanation:

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2 years ago

A scientist has a container with a substance inside. At first, the molecules in the substance move away from each other. Later,

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Answer:

before the substance was a gas it was a liquid.

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2 years ago

Write down your understanding of plate tectonics.

anygoal [31]

Answer:

The theory of plate tectonics states that the Earth's solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle. Oceanic and continental plates come together, spread apart, and interact at boundaries all over the planet.

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2 years ago

What is the entropy change for the freezing process of 1 mole of liquid methanol at its freezing temperature (–97.6˚C) and 1 atm

Rudiy27

Answer : The value of change in entropy for freezing process is, -18.07 J/mol.K

Explanation :

Formula used :

$\Delta S=\frac{\Delta H_{freezing}}{T_f}$

where,

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As we know that:

$\Delta H_{fus}=-\Delta H_{freezing}=-3.17kJ/mol=-3170J/mol$

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

$\Delta S=\frac{\Delta H_{freezing}}{T_m}$

$\Delta S=\frac{-3170J/mol}{175.4K}$

$\Delta S=-18.07J/mol.K$

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3 years ago

If an acid/base dissociates completely in water what type of substance is it? Does this mean the acid/base is dangerous?

hram777 [196]

Answer:

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2 yes they are dangerous

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3 0

3 years ago