An unknown amount of mercury (II) oxide was decomposed in the lab. Mercury metal
was formed and 6.60 L of oxygen gas was released at a pressure of 0.970 atm and
390.0 K. What was the initial weight of mercury oxide in the sample? (1 point)
1) 48.91 grams
2) 64.32 grams
3) 78.32 grams
4) 86.6 grams

The initial weight of mercury oxide in the sample is 4. 86.6 g (grams)

Explanation:

2HgO → 2Hg + O₂

From the given pressure, temperature and volume, we can find the number of moles of oxygen. Using the molar ratio, we can find the moles of HgO and then from that moles and molar mass we can find the mass of HgO.

P = 0.970 atm, T = 390 K , V= 6.60 L

PV = nRT

We need to find n as,

n = 0.2 moles of O₂

To find the moles of HgO,

The molar ratio is 1:2 for O₂ and HgO.

Moles of HgO =

Now we have to multiply the moles by the molar mass of HgO as,

0.4 moles ×216.59 g / mol = 86.6 g of HgO

Thus it is clear that the initial weight of mercury oxide is 86.6 g

water   molecules stay close to each other through cohesion, the collective action of hydrogen bonds between water molecules. cohesion plants draw water upwards from the root through the stem's transport tubes (xylem) to the leaf. this transport occurs even in large trees and against gravity. transpiration, evaporation of water from plant leaves, creates a tension on water molecules being pulled up from the stem and roots.

water also has high (the attraction of one substance to another) properties because of its polar nature. adhesion of water molecules to plant cell walls counteract gravity while water is transported from roots to leaves.

water exhibits a very high surface tension when compared to other liquids. surface tension is a property of a liquid that holds the surface together and allows it to resist an external force. by capillary action, the water forms concave menisci inside the pores. the high surface tension of water pulls the concavity outwards, generating enough force to lift water from the roots to the leaves of plants.

thus, cohesion, along with adhesion and surface tension creates a capillary action that keeps water molecules interacting and moving through the plants out to the leaf cells.

therefore, option d) is the correct answer.

explanation:

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