The compound before the arrow are called blank and the compound after the arrow are called blank

The distance around the earth from east to wester than the distance from north to south is 24,859.73 kilometers. It is 67.3 kilometers apart.

What is distance ?

Distance is a measurement of how far apart two things or points are, either numerically or occasionally qualitatively. Distance can refer to a physical length in physics or to an estimate based on other factors in common usage.

The size or extent of the displacement between two points is referred to as distance. Keep in mind that the distance between two points and the distance traveled between them are not the same. The length of the entire journey taken to get from one point to another is the distance traveled.

Both of these numbers are quite close to the recognized modern estimates for the Earth's diameter and radius, which have since been determined by orbiting spacecraft and are 40,070 km and 6378 km, respectively.

Thus, The distance around the earth from east to wester than the distance from north to south is 24,859.73 kilometers.

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Final answer:

The number of moles is 1.49 and the molar mass is 176.124 g/mol.

Explanation:

To determine the number of moles, we can use the formula:

moles = mass / molar mass

Given that the mass of the gas is 262g and the molar mass is 176.124 g/mol, we can substitute these values into the formula:

moles = 262g / 176.124 g/mol = 1.49 moles (rounded to two decimal places).

Therefore, the number of moles is 1.49. The molar mass of the compound is 176.124 g/mol. In order to determine what element this is, we would need more information about the compound.

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Answer;

exceeds evaporation over land

Precipitation exceeds evaporation over land

Explanation;

• In order to maintain earths water balance, evaporation exceeds precipitation over oceans but precipitation exceeds evaporation over land.
• Water evaporates into the atmosphere from the ocean and to a much lesser extent from the continents. Winds transport this moisture-laden air, often great distances, until conditions cause the moisture to condense into clouds and to precipitate and fall.
• Most precipitation originates by evaporation from the oceans. Over time, water evaporated from the oceans is replenished by inflow of freshwater from rivers and streams.

Ans: 4) PbSO4

Different compounds are soluble in water to a different extent, some of them are completely insoluble in water. Solubility rules help in identifying the water soluble and insoluble compounds.  

Based on the rules:

1) Salts of group IA (Li, Na, K, Rb and Cs) are soluble in water

2) Salts containing NH4+ ions are water soluble

3) All phosphates (PO4³⁻) are insoluble except those containing group IA elements and (NH4)₃PO4

4) All sulfates, SO4²⁻ salts are generally soluble with the exception of Ca2+, Sr2+, Ba2+, Hg₂²⁺, Hg2+, Pb2+ and Ag+

Therefore, among the given examples:

1) KOH contains group 1A (K) therefore soluble

2) Na3PO4 contains group IA element (Na), therefore soluble

3) NH4Cl contains NH4+ ion, therefore soluble

4) Sulfate of lead (Pb) is insoluble

The compound that is insoluble in water is:

• (4) PbSO4 (Lead(II) sulfate)

What is Lead(II) sulfate

Lead(II) sulfate (PbSO4) is generally considered insoluble in water. It forms a precipitate when mixed with water, indicating low solubility. In contrast, the other compounds listed are soluble in water:

(1) KOH (Potassium hydroxide) is soluble in water and dissociates into potassium ions (K+) and hydroxide ions (OH-).

(2) NH4Cl (Ammonium chloride) is soluble in water and dissociates into ammonium ions (NH4+) and chloride ions (Cl-).

(3) Na3PO4 (Sodium phosphate) is soluble in water and dissociates into sodium ions (Na+) and phosphate ions (PO43-).

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