Chemistry, 18.03.2020 00:49, aashna66

2. How many grams of Potassium Chloride, KCl, are produced if 25.0 g of Potassium Chlorate, KClO3, decompose?
2KClO3 → 2KCl + 3O2

3. What is the moles of H2 gas produced when 100.0 grams of Na is added to the reaction?
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)

4. How many moles of Hydrogen, H2, are needed to react with 2.5 moles of Nitrogen, N2?
N2 + 3H2 → 2NH3

Answers: 2

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Answers

answered: senituliii

2. 15.65 grams of KCl is formed if 25.0 g of Potassium Chlorate, KClO3, decompose.

3. 2.17 moles of H2 gas produced when 100.0 grams of Na is added to the reaction.

4. 7.5 moles of Hydrogen, H2, are needed to react with 2.5 moles of Nitrogen, N2.

Explanation:

2. The balanced equation for the chemical reaction is:

2KClO3 ⇒ 2KCl + 3O2

Data given:

mass of KClO3 = 25 grams, atomic mass of KClO3 = 122.55 grams/mole

KCl produced =? atomic mass of KCl = 74.55

number of moles = $\frac{mass}{atomic mass of one mole}$

= $\frac{25}{122.55}$

number of moles = 0.20 moles of KCO3

2 moles of KClO3 decomposes to give 2KCl

0.21 moles of KClO3 decomposes to give x moles of KCl

$\frac{2}{2}$ = $\frac{x}{0.21}$

x = 0.21 moles of KCl

mass of KCl = 0.21 x 74.55

= 15.65 grams of KCl is formed.

3. data given:

2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)

mass of Na added = 100 grams, atomic mass of Na = 22.98 grams/mole

moles of H2 =?

Number of moles of Na = $\frac{mass}{atomic mass of one mole}$

= $\frac{100}{22.98}$

number of moles of Na = 4.35 moles

2 moles of Na gives 1 mole of H2

4.35 moles of Na will give x moles

$\frac{1}{2}$ = $\frac{x}{4.35}$

2x = 4.35

x = 2.17 moles of hydroden gas is produced.

4. Data given:

the balanced chemical equation:

N2 + 3H2 → 2NH3

Number of moles of N2 2.5

from the reaction

1 mole of N2 reacts with 3 moles of H2

The molar ratio of the reactant is 1:3

so, $\frac{1}{3}$ = $\frac{2.5}{x}$

x = 7.5 moles of H2 will react with 2.5 moles of N2.

answered: Guest

Most likely a is the answer - because you generate 38 atp's but also consume an atp. each atp gives approx. less than 4 kcal so probably a is the closest answer.

answered: Guest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

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2. How many grams of Potassium Chloride, KCl, are produced if 25.0 g of Potassium Chlorate, KClO3, d...