1.15 g of a metallic element reacts with 300 cm3 of oxygen at 298 K and 1 atm pressure, to form. an oxide which contains O2– ion
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Answer:
The volume of nitrogen oxide formed is 35.6L
Explanation:
The reaction of nitric acid with copper is:
Cu(s) + 4HNO₃ → Cu(NO₃)₂ + 2NO₂(g) + 2H₂O(l)
Moles of copper are:
Moles of nitric acid are:
As 1 mol of Cu reacts with 4 moles of HNO₃:
0.697 mol Cu × (4mol HNO₃ / 1mol Cu) = 2.79 moles of HNO₃ will react. That means Cu is limiting reactant.
Moles of NO₂ produced are:
0.697 mol Cu × (2mol NO₂ / 1mol Cu) = <em>1.394 moles of NO₂</em>
Using PV = nRT
<em>Where P is pressure (735torr / 760 = 0.967atm); n are moles (1.394mol); R is gas constant (0.082atmL/molK); T is temperature (28.2°C + 273.15 = 301.35K). </em>
Thus, volume is:
V = nRT / P
V = 1.394mol×0.082atmL/molK×301.35K / 0.967atm
V = 35.6L
<em>The volume of nitrogen oxide formed is 35.6L</em>
Sugar burns in air describes a chemical property
<h3>Further explanation </h3>In the matter of a substance, there is a process of change.
2 changes occur in the mater, namely: physical changes and chemical changes
Classification uses the principle of the initial and final state of the substance.
Physical changes are changes in the matter which in the process do not cause new substances. So the properties of the particles remain the same.
Generally, the physical changes that occur are changes in shape / size and changes due to heating, or changes in volume
Example:
- melting
a solid changes to a liquid
- freezing
a liquid changes to a solid
- boiling
a solid changes to a liquid
Chemical changes are changes in the process that produce new substances that are different from the initial / forming substances. Chemical changes are usually known as chemical reactions. So there are products / reactions and reactants
So in chemical changes, there is a change in the molecule / particle
From this we can know the physical and chemical properties of a substance
- physical properties:
melting point, viscosity, ductile, freezing point, boiling point, density, odor, solubilty, turbidity, color etc.
- chemical properties:
Highly flammable, corroded, explosive, toxic etc.
Let's look at the answer choices in the attached picture
- 1. water boils at 100 C
physical properties of water that is boiling point
- 2. mercury is liquid at room temperature
physical properties: the form of substances
- 3. Helium is the lightest monoatomic element
physical properties: the weight or mass of a substance
- 4. sugar burns in water to form water and carbon dioxide
chemical properties: the formation of new substances
<h3>Learn more </h3>an example of a physical change
example of a chemical change brainly.com/question/9388643
examples of chemical changes brainly.com/question/11189422
