The population of rabbits in a forest is decreasing. Foxes in that region are now competing with each other for the limited numb
2 answers:
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Answer : The compound contains the highest percentage of lead (by mass) is, PbS.
Explanation :
To calculate the percentage of lead in sample, we use the equation:
<u>For :</u>
Mass of = 239.3 g
Mass of Pb = 207.2 g
Putting values in above equation, we get:
The percentage of lead in the is 86.58 %.
<u>For :</u>
Mass of = 267.2 g
Mass of Pb = 207.2 g
Putting values in above equation, we get:
The percentage of lead in the is 77.55 %.
<u>For :</u>
Mass of = 259.7 g
Mass of Pb = 207.2 g
Putting values in above equation, we get:
The percentage of lead in the is 79.78 %.
<u>For :</u>
Mass of = 545.3 g
Mass of Pb = 207.2 g
Putting values in above equation, we get:
The percentage of lead in the is 37.99 %.
Hence, from this we conclude that, the compound PbS contains the highest percentage of lead (by mass).
<u>Answer:</u> The correct answer is Option 1, Option 2 and Option 3.
<u>Explanation:</u>
A base is defined as the substance which releases hydroxide ion when dissolved in water.
For the given options:
- <u>Option 1:</u>
When ammonia is dissolved in water, it produces ammonium hydroxide which forms a basic solution.
- <u>Option 2:</u>
When sodium oxide is dissolved in water, it produces ammonium hydroxide which forms a basic solution.
- <u>Option 3:</u>
When lithium hydroxide is dissolved in water, it produces aqueous lithium hydroxide which forms a basic solution.
- <u>Option 4:</u>
When phosphorus pentoxide is dissolved in water, it produces phosphoric acid which forms an acidic solution.
Hence, the correct answer is Option 1, Option 2 and Option 3.
The mass of olive oil : 690 g
<h3>Further explanation </h3>Density is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
Density formula:
ρ = density
m = mass
v = volume
Given
volume of olive oil = V=750 ml
density of olive oil = ρ = 0.92 g/ml
Required
the mass of olive oil
Analysis
the formula :
Solution
Paraphrase
the mass of olive oil : 690 g