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3 years ago

13

Refer to the following balanced equation in which ammonia reacts with nitrogen monoxide to produce nitrogen and water. 4NH3(g) +

6NO(g) → 5N2(g) + 6H2O(1) How many moles of NH3 are necessary to produce 0.824 mol N2 ?
___ mol NH3

1 answer:

grigory [225]3 years ago

5 0

Answer:

0.659 mol

Explanation:

n(NH3)/n(N2) = 4/5

n(NH3) = 4/5×0.824

= 0.659 mol

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What does an ecosystem's nonliving surroundings include? (Select all that apply.) sun water bacteria soil

Ghella [55]

Answer: The nonliving parts of an ecosystem are called abiotic factors. Abiotic factors include water, sunlight, oxygen, temperature, and soil.

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3 years ago

Bromothymol blue is a chemical indicator that turns blue at ph values greater than 7. in which of these solutions would a blue c

Effectus [21]

The two solutions are

CH3COOH (acetic acid) : it is a weak acid and will dissociate less (as its Ka is very low) .Even then it will give an acidic solution. The concentration of proton will be less but it will be more than the concentration of hydroxide ions and pH of solution will be less than 7.

Thus bromothymol blue will not turn blue

NH3: ammonia

It is a weak base and will dissociate less to give hydroxide ion. EVen then it will be basic in nature. The concentration of hydroxide ion will be less but it will be more than the concentration of protons and pH of solution will be more than 7.

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3 years ago

Which of the following reactions is an example of a single replacement reaction?

babunello [35]

Answer:

C

Explanation:

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Therefore, the number of reactants must be equal to the number of products, since no actual combinations / break ups are occurring.

Answers A and D are eliminated right away since the number of products don't equal the number of reactants.

Answer B is wrong because it does not show simply one element being replaced, instead, two compounds are being formed. It doesn't look like the example given.

Only answer C shows that one element is replaced:

The iodine is replaced with bromine to form NaBr + I2

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3 years ago

4 What is the maximum number of students among whom 125 oranges, 150 citrus

oksano4ka [1.4K]

Answer:

25

Explanation:

fing the highest common factor

pime factorisation:

125=5×5×5

150=2×3×5×5

225=3×3×5×5

find the common numbers in all prime numbers

》5×5=25

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3 years ago

Which phrase best describes a covalent bond?

kotegsom [21]

<u>Answer:</u> The correct answer is sharing of electrons.

<u>Explanation:</u>

Covalent bond is defined as the bond which is formed when sharing of electrons takes place between the atoms. This is usually formed between two non-metals.

<u>For Example:</u> Formation of hydrogen chloride molecule

Electronic configuration of hydrogen = $1s^1$

Electronic configuration of chlorine = $1s^22s^22p^63s^23p^5$

Hydrogen and chlorine atoms are need only 1 electron to attain stable electronic configuration. So, they share electron and form covalent bond.

Hence, the correct answer is sharing of electrons.

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4 years ago