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katovenus [111]
2 years ago
10

Which of the following is an example of a mixture?

Chemistry
2 answers:
kow [346]2 years ago
6 0

Answer:

the answer is b

Explanation:

kap26 [50]2 years ago
3 0
B. the atmosphere is an example of a mixture
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How many grams of fluorine are needed to react with 8.5g of phosphorus?
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Step 1: write the equation:

                                          P₄(s) + 6F₂(g) → 4PF₃(g) 


Step 2: Molar mass of P₄ = 30.97 g/mol × 4 = 123.88 g/mol


Step 3: Number of moles of phosphorus

                                                    n = m/M 

                                                    n = 8.5 g/123.88g/mol

                                                    n = 0.07 moles


Step 4: 0.07 × 12 = 0.84 moles of fluorine.

Fluorine is diatomic gas so we multiplied the number of moles by 12.


Step 5: To find the mass of fluorine we multiply the number of moles with the molar mass.

                            Mass of fluorine = 0.84 ×  228 

                                                        = 191.52 grams.

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What is the electron configuration for a neutral atom of fluorine.
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Answer and Explanation: The full ground-state electron configuration for a fluorine atom is 1s2, 2s2, 2p5. We determine this by first identifying the number of electrons in a fluorine atom. If the atom is neutral, it will have nine electrons to match the nine protons int he fluorine nucleus

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