Correct Answer: B. axe

Correct Answer: B. she discovered she was 3 months pregnant and abortion was impossible

Correct Answer: C. 86.5%

Explanation

To find the mean of a certain set of numbers we need to add all enteries together and then divide by how many numbers you have. In our case we do: (87+92+77+90)/4 = 86.5

Correct Answer: B. the vain expectations of man

Correct Answer: B) 1.0atm

Explanation

To answer this question, we need to apply Dalton's Law of Partial Pressures, which states that the total pressure of a gas mixture is the sum of the partial pressures of the individual gases.

First, let's find the mole fraction of oxygen and nitrogen in the mixture. We can do this by dividing the given mass of each gas by its molar mass.

Oxygen: \( \frac{80.0 \, g}{32.0 \, g/mol} = 2.5 \, mol \)

Nitrogen: \( \frac{56.0 \, g}{28.0 \, g/mol} = 2.0 \, mol \)

Now, we need to calculate the mole fraction of each gas. The mole fraction is the ratio of the moles of a particular gas to the total moles of the gas mixture.

Mole fraction of oxygen: \( \frac{2.5 \, mol}{2.5 \, mol + 2.0 \, mol} = \frac{2.5}{4.5} \)

Mole fraction of nitrogen: \( \frac{2.0 \, mol}{2.5 \, mol + 2.0 \, mol} = \frac{2.0}{4.5} \)

Now that we have the mole fractions, we can use Dalton's Law of Partial Pressures to find the partial pressure of oxygen.

\( P_{O_2} = X_{O_2} \times P_{total} \)

\( P_{O_2} = \frac{2.5}{4.5} \times 1.8 \, atm \)

\( P_{O_2} = 1.0 \, atm \)

So, the partial pressure of oxygen in the mixture is1.0 atm, which corresponds toOption B.

Explanation

(a)i. An acid is any compound which in a chemical reaction is able to attach itself to an unshared pair of electrons in another molecule-a base, to form a new compound

ii. - AlCl3

- BF3

- BeF2

- H+

- K+

(b). It is the addition of NaCl to the reaction mixture in soap production to facilitate the precipitation of soap from the mixture

(c) Reagent -- AgNO3 in NH3(aq) / Ammonical silver trioxonitrate

condition-- heat

(d) - It is the fraction of a given isotope in amixture of isotopes of the same element

- The % of an isotope with a specific atomic mass found in a naturally occuring sample of an element.

(e)i. Because the element is

- Unreactive

- Stable

- A noble gas

- Inert

- Completely filled outermost shell

ii. Because of weak forces between the molecules hence not much heat is needed to break the forces

(f) - (Conc) HNO3 produces brown fumes (of NO2) when copper tunings are added to it/copper (II) salt is added but H2SO4 will not react with the copper tuning/Copper (II) salt

- When Conc. H2SO4 is added to sugar it chars the sugar but Conc. HNO3 will not.

- Add BaCl2 solution to each acid white precipitate indicates H2SO4 no precipitate indicates HNO3

(g)

(h) Ionization energy decreases down group 1 elements, the lower the ionization energy, the easier to loose an electron hence the higher the reactive of the elements

(i) Molecular formula shows the actual number of atoms of each element in a molecule

(j) NH3 will deviate more because it has a larger volume and also it has a stronger intermolecular forces

Correct Answer: B. of her love for Agbadi

Explanation

It is obvious that once Ona is married, she must leave her father's house except she gives birth to a boy. Unfortunately, she dies during childbirth.

Correct Answer: C. liver

Correct Answer: B. The Central banks

Correct Answer: C. mean water temperature not less than 20°C