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3 years ago

ASAP WILL GIVE BRAINLIEST!!

Chemistry

1 answer:

Nataly_w [17]3 years ago

6 0

Answer:

The answer to your question is a) N₂ b) 3.04 g of NH₃

Explanation:

Data

mass of H₂ = 2.5 g

mass of N₂ = 2.5 g

molar mass H₂ = 2.02 g

molar mass of N₂ = 28.02 g

molar mass of NH₃ = 17.04 g

Balanced chemical reaction

3H₂ + 1 N₂ ⇒ 2NH₃

Calculate the theoretical yield 3H₂ / N₂ = 3(2.02) / 28.02 = 0.22

Calculate the experimental yield H₂/N₂ = 2.5/2.5 = 1

Conclusion

The limiting reactant is N₂ (nitrogen) because the experimental proportion was higher than the theoretical proportion.

28.02 g of N₂ -------------------- (2 x 17.04) g of NH₃

2.5 g of N₂ -------------------- x

x = (2.5 x 2 x 17.04) / 28.02

x = 85.2 / 28.02

x = 3.04 g of NH₃

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A compound contains 6.0 g of carbon and 1.0 g of hydrogen and has a molar mass of 42.0 g/mol.

makvit [3.9K]

Answer:

%C = 85.71 wt%; %H = 14.29 wt%; Empirical Formula => CH₂; Molecular Formula => C₃H₆

Explanation:

%Composition

Wt C = 6 g

Wt H = 1 g

TTL Wt = 6g + 1g = 7g

%C per 100wt = (6/7)100% = 85.71 wt%

%H per 100wt = (1/7)100% = 14.29 wt % or, %H = 100% - %C = 100% - 85.71% = 14.29 wt% H

What you should know when working empirical formula and molecular formula problems.

Empirical Formula=> smallest whole number ratio of elements in a compound

Molecular Formula => actual whole number ratio of elements in a compound

Empirical Formula Weight x Whole Number Multiple = Molecular Weight

From elemental %composition values given (or, determined as above), the empirical formula type problem follows a very repeatable pattern. This is ...

% => grams => moles => ratio => reduce ratio => empirical ratio

for determination of molecular formula one uses the empirical weight - molecular weight relationship above to determine the whole number multiple for the molecular ratios.

Caution => In some 'textbook' empirical formula problems, the empirical ratio may contain a fraction in the amount of 0.25, 0.50 or 0.75. If such an issue arises, multiply all empirical ratio numbers containing 0.25 and/or 0.75 by '4' to get the empirical ratio and multiply all empirical ration numbers containing 0.50 by '2' to get the final empirical ratio.

This problem:

Empirical Formula:

Using the % per 100wt values in part 'a' ...

% => grams => moles

%C => 85.71% => 85.71 g* / 100 g Cpd => (85.71 / 12) = 7.14 mol C

%H => 14.29% => 14.29 g / 100 g Cpd => (14.29 / 1) = 14.29 mol H

=> Set up mole Ratio and Reduce to Empirical Ratio:

mole ratio C:H => 7.14 : 14.29

To reduce mole values to the smallest whole number ratio, divide all mole values by the smaller mole value of the set.

=> 7.14/7.14 : 14.29/7.14 => Empirical Ration=> 1 : 2

∴ Empirical Formula => CH₂

Molecular Formula:

(Empirical Formula Wt)·N = Molecular Wt => N = Molecular Wt / Empirical Wt

N = 42 / 14 = 3 => multiply subscripts of empirical formula by '3'.

Therefore, the molecular formula is C₃H₆

3 0

3 years ago

Antacid has a pH of 11. What does that tell you about its concentration of hydrogen ions? What does that tell you about its conc

MAVERICK [17]

Answer: The concentration of hydrogen ions is $10^{-11}M$ and the concentration of hydroxide ions is $10^{-3}M$ . Thus the concentration of hydroxide ions is more than the concentration of hydrogen ions.

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

$pH=-\log [H^+]$

$pOH=-\log[OH^-]$

Putting in the values:

$11=-\log[H^+]$

$[H^+]=10^{-11}M$

$pH+pOH=14$

$pOH=14-11=3$

$3=-log[OH^-]$

$[OH^-]=10^{-3}M$

Thus the concentration of hydroxide ions is more than the concentration of hydrogen ions.

3 0

3 years ago

When two atoms form a covalently-bonded diatomic molecule, the distance between the nuclei at which the potential energy is at a

Dovator [93]

Answer:

Bond length.

Explanation:

During formation of a covalent bond between atoms the total potential energy of the new molecule is less than the sum of energy of the two atoms. This is the energy orientation for the formation of bond. This is due to gain of stability by full filling the octet of the atoms. In covalent bond sharing of electrons occur. When two atoms approach each other there is decrease in energy till the bond length of the molecule, after this if we try to minimize the distance between atoms, the repulsion forces start to act their role.

3 0

4 years ago

Which statement below best describes how the interaction of two systems causes a human arm to bend?

Galina-37 [17]

Answer:

your answer is C I believe

3 0

3 years ago

Can you identify the end arrangement found in fatty acids as wells amino acids

3241004551 [841]

In amino acids the end terminal is NH2 - the amine group and in fatty acids it is COOH the carboxyl group.

Explanation:

Fatty acids are merely long chain radical acids that contains one carboxyl and a protracted hydrophobic organic compound chain. Whereas, amino acids are the compounds that contain both a carboxyl at and an chemical group hooked up to identical atom.

8 0

3 years ago