Answer:
2.38x10²³ atoms oxygen
Explanation:
To solve this question we need to convert the mass of sand to moles using its molar mass (Molar mass SiO₂ = 60.08g/mol). Twice these moles are the moles of Oxygen and using Avogadro's number we can find the amount of atoms of Oxygen in the mixture:
<em>Moles SiO₂:</em>
11.87g * (1mol / 60.08g) = 0.1976moles SiO₂
<em>Moles Oxygen:</em>
0.1976moles SiO₂* 2 = 0.3951moles oxygen
<em>Atoms oxygen:</em>
0.3951moles oxygen * (6.022x10²³atoms / 1mol O₂) =
<h3>2.38x10²³ atoms oxygen</h3>
Answer:
Mole fraction O₂ = 452 mmHg/ 780mmHg → 0.579
Explanation:
Mole fraction is defined as the quotient between Partial Pressure of a gas, in a mixture and the Total Pressure from the mixture
Partial pressure of a gas/ Total pressure
Mole fraction O₂ = 452 mmHg/ 780mmHg → 0.579
Be careful, because mole fraction doesn't have units
It is a mixture, specifically a homogeneous mixture. It is the same composition all the way through. The concentrations of the dissolved substances are the same, so it is a mixture.
The product that is soluble in water would be potassium nitrate or KNO3 while it is silver carbonate (Ag2CO3) that would form a solid precipitate after the reaction. Ag2CO3 is insoluble in water. One indication would be the presence of the silver ion. Almost all of the compounds of silver are insoluble or has poor solubility in water.
There are 6 electrons in an atom of carbon 13. Hope this helps!