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Maslowich
3 years ago
7

The energy available to primary consumers in an energy pyramid is 800 kilocalories. Approximately how much energy is used by the

primary consumers for their physical functions?
A. Less than 720 kilocalories
B. 720 kilocalories
C. 880 kilocalories
D. More than 880 kilocalories
Chemistry
2 answers:
ki77a [65]3 years ago
5 0
The answer is B, Let me know if you get it right!
torisob [31]3 years ago
3 0

Answer:

B. 720 kilocalories

Explanation:

The primary consumers use about 90% of available energy pyramid for their physical functions. In order to solve this exercise, we need to calculate the 90% of 800 kilocalories.

We can state that there is  a direct linear relationship between the kilocalories and the percentage. This means that for a higher percentage the amount of kilocalories will be greater.

We can write :

\frac{800kilocalories}{100}=\frac{x}{90}

Where the denominators are percentages.

Solving for x :

x=\frac{(800kilocalories).(90)}{100}

x=720kilocalories

The correct option is B. 720 kilocalories

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6 0
3 years ago
Read 2 more answers
What mass of propane could burn in 48.0 g of oxygen? C3H8 + 5O2 → 3CO2 + 4H2O
Ipatiy [6.2K]

Answer:

Mass = 13.23 g  

Explanation:

Given data:

Mass of oxygen = 48.0 g

Mass of propane burn = ?

Solution:

Chemical equation:

C₃H₈ + 5O₂     →      3CO₂ + 4H₂O

Number of moles of oxygen:

Number of moles = mass/molar mass

Number of moles = 48.0 g/ 32 g/mol

Number of moles = 1.5 mol

now we will compare the moles of propane and oxygen.

              O₂           :          C₃H₈

               5            :            1

             1.5            :          1/5×1.5 = 0.3 mol

Mass of propane burn:

Mass = number of moles × molar mass

Mass = 0.3 mol × 44.1 g/mol

Mass = 13.23 g  

6 0
3 years ago
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