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3 years ago

10

What are stars made of? Group of answer choices

1 answer:

Alex787 [66]3 years ago

3 0

Answer:

The correct answer is option A.

Explanation:

Stars are bundles of hot gases which primarily consists of hydrogen gas and then helium. Their shine is due to thermonuclear fusion of hydrogen into helium or burning of hydrogen gas into helium in their cores which releases large amount of energy and later this process leads to formation of some heavier elements.

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WILL GIVE BRANLIEST!!<br><br> Carbon tetrachloride (CCl4) is <br> ionic<br> covalent

monitta

Answer:

Covalent

Explanation:

In the carbon tetrachloride molecule, four chlorine atoms are positioned symmetrically as corners in a tetrahedral configuration joined to a central carbon atom by single covalent bonds

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Draw the electron dot diagram of each the atoms in the molecule.

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At 25.0 °C the Henry's Law constant for sulfur hexafluoride (SP) gas in water is 2.4x 10 M/atm Calculate the mass in grams of SF

Dmitry_Shevchenko [17]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The mass is $m = 0.0349 \ g$

Explanation:

From the question we are told that

The Henry's Law constant is $k = 2.4 *10^{10} M/atm$

The volume of water is $V = 525 \ ml = 0.525 \ L$

The partial pressure is $P = 1.90 \ atm$

The temperature is $T = 25 ^oC$

Henry's law is mathematically represented as

$C = P * k$

Where C is the concentration of sulfur hexafluoride(SP)

substituting value

$C = 1.90 * 2.4*10^{-4}$

$C = 4.56*10^{-4} \ M$

The number of moles of SP is mathematically represented as

$n = C * V$

substituting value

$n = 0.525 * 4.56*10^{-4}$

$n = 2.39 *10^{-4} \ moles$

The mass of SP that dissolved is

$m = n * Z$

Where Z is the molar mass of SP which has a constant value of

$Z = 146 g/mole$

So

$m = 2.394*10^{-4} * 146$

$m = 0.0349 \ g$

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3 years ago