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Author Question: Approximately how many elements occur naturally on Earth? A) 20 B) 60 C) 90 D) ... (Read 142 times)

waynest

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on: Aug 27, 2018
Approximately how many elements occur naturally on Earth?
 
  A) 20
  B) 60
  C) 90
  D) 115

Question 2

What is the mass in grams of 1.000 mole of P2O5?
 
  A) 239.03 g
  B) 61.96 g
  C) 142.0 g
  D) 46.98 g


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Li Jun

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Reply #1 on: Aug 27, 2018
Answer to Question 1

C

Answer to Question 2

C


waynest

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Reply #2 on: Aug 27, 2018
TY


Li Jun

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Reply #3 on: Aug 27, 2018
You're welcome


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