Answer:
Explanation:
<u>1. Number of moles of gasoline</u>
a) Convert 60.0 liters to grams
- mass = 0.77kg/liter × 60.0 liter = 46.2 kg
- 46.2kg × 1,000g/kg = 46,200g
b) Convert 46,200 grams to moles
- molar mass of C₈H₁₈ = 114.2 g/mol
- number of moles = mass in grams / molar mass
- number of moles = 46,200g / (114.2 gmol) = 404.55 mol
<u>2. Number of moles of carbon dioxide, CO₂ produced</u>
a) Balanced chemical equation (given):
- C₈H₁₈ (l) + ²⁵/₂ O₂ (g) → 8 CO₂ (g) + 9 H₂O (g)
b) mole ratio:
- 1 mol C₈H₁₈ / 8 mol CO₂ = 404.55 mol C₈H₁₈ / x
Solve for x:
- x = 404.55mol C₈H₁₈ × 8 mol CO₂ / 1mol C₈H₁₈ = 3,236.4 mol CO₂
<u> 3. Convert the number of moles of carbon dioxide to volume</u>
Use the ideal gas equation:
- R = 0.08206 (mol . liter)/ (K . mol)
Substitute and compute:
- V =3,236.4 mol × 0.08206 (mol . liter) / (K . mol) 298.15K / 1 atm
Round to two significant figures (because the density has two significant figures): 79,000 liters ← answer
Ar is a substance that is a gas at room temperature and atmospheric pressure.
Answer:
Three.
Explanation:
When counting the number of significant figures in a decimal number, you start counting from the right of the decimal point.
0
.00203
Counting from left to right from the decimal point , there are 5 digits.
However, the zeroes before any natural number is not counted as a significant figure.
0.00
203
Thus, there are
3
significant figures ie. 203.
Note: any other numbers added to the right of
0.00203
is also counted as a significant number.
eg.
0.002031
has 4 significant figures.
eg.
0.002030
has 4 significant figures.
Answer:
They attract or repel other charged objects without touching them.
Explanation:
My chemistry teacher always says like repels like opposite attracts.
Deforestation, Desertification and Urbanization are very closely related phenomenon whose cause and effects are briefly discussed below.
<h3><u>Explanation:</u></h3>
Deforestation is caused due to cutting of trees for economic purposes and other poachers.
Deforestation effects the natural habitat of the animals of forests leading to endangering of different plants and animals. It also reduces diversity of environment, causes global warming, change in climate, rainfall patterns etc.
Desertification is caused due to deforestation, due to natural calamities like forest fires, overgrazing and even due to over population.
Desertification causes a huge loss to environment. Erosion of soil, deepening of ground water levels, loss of rainfall, draught are common. Rise in temperature and change of climates are also seen.
Urbanisation is caused by main two reasons - over population and rural to urban migration of people.
Urbanization has several good effects like growth of technologies etc. But it also increases disease rates due to increase in pollution. Several mental stress and depression are also seen to affect urban people more than rural ones.
