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alexandr1967 [171]
3 years ago
9

Which of the following can be formed by physically combining pure substances? a. an element c. a compound b. a mixture d. all of

the above
Chemistry
1 answer:
rusak2 [61]3 years ago
8 0

Answer:

all of the above al a,b c

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Carbon dioxide is a noble gas.
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Yes

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Who is Gregor Mendeſ, and what did he<br> discover about traits?
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Gregor Mendel, through his work on pea plants, discovered the fundamental laws of inheritance. He deduced that genes come in pairs and are inherited as distinct units, one from each parent. Mendel tracked the segregation of parental genes and their appearance in the offspring as dominant or recessive traits.

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For the chemical reaction:
Kamila [148]

Answer:

Volume of ammonia produced = 398.7 dm³

Explanation:

Given data:

Volume of N₂ = 200 dm³

Pressure and temperature = standard

Volume of ammonia produced = ?

Solution:

Chemical equation:

N₂ + 3H₂     →      2NH₃

Number of moles of N₂:

PV = nRT

1 atm× 200 L = n× 0.0821 atm.L/mol.K × 273 K

n = 200 atm.L /22.41 atm.L/mol

n = 8.9 mol

Now we will compare the moles of ammonia and nitrogen.

               N₂          :         NH₃

                1            :           2

              8.9          :        2/1×8.9 = 17.8 mol

Volume of ammonia:

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3 years ago
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