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beks73 [17]
3 years ago
8

Please I really need help with this

Chemistry
2 answers:
sesenic [268]3 years ago
5 0

Answer:

B. It is used to open and close the circuit.

Ksju [112]3 years ago
3 0

Answer:

B. it is used to open and close the circuit

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The variables _______ and ________ affect the gravitational force between objects.
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I think the answer is A
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10. pls pls help me
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Explanation:

this is the answer

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3 years ago
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  

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The emission spectrum of hydrogen is shown below. What do the lines in the
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