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4 years ago

What is the volume of 5.8g of H2?

1 answer:

4 0

At standard temperature and pressure, one mole of gas occupies 22.4 L. Knowing this, we must convert the grams to moles and moles to liters to get your answer. Here's how you do it!
$\frac{5.8gH2}{1} | \frac{1moleH2}{2.0gH2}| \frac{22.4LH2}{1moleH2} \\ \frac{5.8*1*22.4LH2}{2.0} \\ \frac{129.92LH2}{2.0} \\ 64.96LH2 \\ 65LH2$
With significant figures accounted for, 5.8 grams of hydrogen gas occupies 65 L.

Hope this helps!

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Why is it important to perform the reagent tests last?

leonid [27]

<span>Spontaneous reactions need to be discovered first. Also, if reagents are transferred to the other cups used in the tests, it could contaminate them, leading to different colors being seen and the test results being invalid. Doing the reagent tests last ensure that the cups and reagents are only used on the substances that they are intended to.</span>

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3 years ago

At a certain temperature, the percent dissociation (ionization) of chlorous acid, HClO2, in a 1.43 M solution water is 8.0%. Cal

lakkis [162]

Answer:

Kₐ = 9.9 × 10⁻³

Explanation:

HClO₂ + H₂O ⇌ H₃O⁺ + ClO₂⁻

0.080 × 1.43 = 0.1144

So, at equilibrium,

[H₃O⁺] = [ClO₂⁻] = 0.1144

[HClO₂] = 1.43 – 0.1144 = 1.316

Kₐ = {[H₃O⁺][ClO₂⁻]}/[HClO₂]; Substitute values

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3 years ago

Which of these are animal adaptations that help animals live in the deciduous forest biome? Select all that apply.

marysya [2.9K]

Answer:

hard outer skin to reduce loss of water

Explanation:

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3 years ago

When a solution of sodium lactate,

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Answer:

Use the following answers for questions 1 - 2. (1984 - #8 & 9)

(A) A network solid with covalent bonding

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(D) An ionic solid

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2. Silicon dioxide, SiO2 (A)

Use these answers for questions 3-6 (1989 #11 – 14)

(A) hydrogen bonding (B) hybridization (C) ionic bonding

(D) resonance (E) van der Waals forces (London dispersion forces)

3. Is used to explain why iodine molecules are held together in the solid state (E)

4. Is used to explain why the boiling point of HF is greater than the boiling point of HBr (A)

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6. Is used to explain the fact that the carbon-to-carbon bonds in benzene, C6H6, are identical (D)

Use the following diagram for questions 7-8

(1989 - #49&51)

7. The normal boiling point of the substance

represented by the phase diagram above is

(A) -15 °C (B) -10 °C

(E) not determinable from the diagram

8. For the substance represented in the diagram,

which of the phases is most dense and which is

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3 years ago

How are we made from star debris? What does this mean? Explain

4vir4ik [10]

Answer:

How star stuff got to Earth

When it has exhausted its supply of hydrogen, it can die in a violent explostion, called a nova. The explosion of a massive star, called a supernova, can be billions of times as bright as the Sun , according to "Supernova," (World Book, Inc., 2005). Such a stellar explosion throws a large cloud of dust and gas into space, with the amount and composition of the material expelled varying depending on the type of supernova.

A supernova reaches its peak brightness a few days after it first occurred, during which time it may outshine an entire galaxy of stars. The dead star then continues to shine intensely for several weeks before gradually fading from view, according to "Supernova."

The material from a supernova eventually disperses throughout interstellar space. The oldest stars almost exclusively consisted of hydrogen and helium, with oxygen and the rest of the heavy elements in the universe later coming from supernova explosions, according to "Cosmic Collisions: The Hubble Atlas of Merging Galaxies," (Springer, 2009).

"It's a well-tested theory," Impey said. "We know that stars make heavy elements, and late in their lives, they eject gas into the medium between stars so it can be part of subsequent stars and planets (and people)."

Cosmic connections

So, all life on Earth and the atoms in our bodies were created in the furnace of now-long-dead stars, he said.

In 2002, music artist Moby released "We Are All Made of Stars," explaining during a press interview that his lyrics were inspired by quantum physics. "On a basic quantum level, all the matter in the universe is essentially made up of stardust," he said.

Explanation:

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3 years ago