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2 years ago

CH4(g) + 2O2(g) = CO2(g) + 2H2O(g)

Chemistry

1 answer:

krek1111 [17]2 years ago

3 0

Answer:

0.04 moles of CH₄ are required

Explanation:

Given data:

Number of moles of CH₄ required = ?

Number of moles of O₂ present = 0.08 mol

Solution:

Chemical equation:

CH₄ + 2O₂ → CO₂ + 2H₂O

now we will compare the moles of oxygen and methane.

O₂ : CH₄

2 : 1

0.08 : 1/2×0.08 = 0.04

Thus, 0.04 moles of CH₄ are required.

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If a certain compound has a formula XCl₃ what is the valency of X?

asambeis [7]

The general form of a compound can be written in the form of:

[X(a) Y(b)] ^ c

Where a and b are subscripts, and c is the superscript of the whole formula.

The relationship that we can derived here between the constants is:

(valence of X) * a + (valence of Y) * b = c

Since the formula obviously has no superscript, therefore c = 0. We also know in chemistry class that the valence of Cl is -1, therefore:

valence of X * 1 + (-1) * 3 = 0

valence of X - 3 = 0

valence of X = 3

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2 years ago

A graduated cylinder is filled 25.0 mL with water and a piece of granite is placed in the cylinder, displacing the level to 37.2

kvv77 [185]

The volume of the granite piece in Cm³ is 12.2 cm³

calculation

volume of granite = (volume of cylinder after placing granite - volume of cylinder before placing granite

= 37.2 ml - 25.0 ml = 12.2 ml

convert ml to Cm³

that is 1 ml = 1 cm³

12.2 ml = ? cm³

by cross multiplication

=(12.2 ml x 1 cm³) / 1 ml = 12.2 cm³

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2 years ago

Which of the following have the lowest density solids rocks liquids gases

denis23 [38]

Answer:

gases

Explanation:

because the solid (steel) is the most dense, the gas (air) is the least dense, and the density of the liquid (water) is in between.

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3 years ago

Some radioactive nuclides have very short half-lives, for example, I-31 has a half-life of approximately 8 days. Pu-234, by comp

lorasvet [3.4K]

Answer:

Here's what I find.

Explanation:

Iodine-131

Iodine-131 is both a beta emitter and a gamma emitter.

$_{53}^{131}\text{I}\longrightarrow \, _{54}^{131}\text{Xe} +\, _{-1}^{0}\text{e} +\, _{0}^{0}\gamma$

About 90 % of the energy is β-radiation and 10 % is γ-radiation. Both forms are highly energetic.

The main danger is from ingestion. The iodine concentrates in thyroid gland, where the β-radiation destroys cells up to 2 mm from the tissues that absorbed it.

Both the β- and γ-radiation cause cell mutations that can later become cancerous. Small doses, such as those absorbed from the nuclear disasters in the Ukraine and Japan, can cause cancers years after the original iodine has disappeared.

Plutonium-239

Plutonium-239 is an alpha emitter.

$_{94}^{239}\text{U} \longrightarrow \, _{92}^{235}\text{Xe} + \, _{2}^{4}\text{He}$

Alpha particles cannot penetrate the skin, so external exposure isn't much of a health risk.

However, they are extremely dangerous when they are inhaled and get inside cells. They travel first to the blood or lymph system and later to the bone marrow and liver, where they cause up to 1000 times more chromosomal damage than beta or gamma rays.

It takes about 20 years for plutonium to be eliminated from the liver around 50 years for from the skeleton, so it has a long time to cause damage.

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3 years ago

As student used a pen to draw a line across a piece of chromatography paper. he then placed a sample of dye on the drawn line fo

AleksAgata [21]

Answer is in the photo. I can only upload it to a file hosting service. link below!

tinyurl.com/wpazsebu

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2 years ago