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ANEK [815]
3 years ago
9

What is the electron configuration of Ca2+

Chemistry
1 answer:
kozerog [31]3 years ago
6 0
Ca2 ; Z=20

1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
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A solution is prepared by diluting 50.00 ml of 2.575 m solution of hno3 to 250.0 ml. what is the molarity of the resulting solut
larisa [96]
Thank you for posting your question here at brainly. Below are the choices that can be found elsewhere:

12.88 M 
<span>0.1278 M </span>
<span>0.2000 M </span>
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Below is the answer:

<span>5 times diluted (250/50),so 2.575/5=0.515 M
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I hope it helps. 
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Answer:

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3 years ago
Một hỗn hợp X gồm CH3OH; C2H5OH; phenol có khối lượng 28,9 gam phản ứng vừa hết với 100ml dung dịch NaOH 2M. Phần trăm theo khối
slavikrds [6]

Answer:

nNaOH = 0,2 mol

Trong hỗn hợp các chất đề bài cho chỉ có phenol tác dụng với NaOH

C6H5OH + NaOH → C6H5ONa + H2O

   0,2  ←     0,2 (mol)

⟹ mphenol = 0,2.94 = 18,8 gam

⟹  

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Explanation:

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