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Daniel [21]
3 years ago
11

Which element is a noble gas? (1) krypton (3) antimony (2) chlorine (4) manganese

Chemistry
2 answers:
Leno4ka [110]3 years ago
8 0

Answer:

Krypton

Explanation:

Maksim231197 [3]3 years ago
5 0
The element from those four that is a noble gas is krypton. 
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How many grams of tris (mw 121.1) would you need to prepare 100 ml of a 100 mm tris solution? _________ grams?
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Molarity = (Mass/ molar mass) x (1/ volume of solution in Litres)

Mass = Molarity x molar mass x  volume of solution in Litres

Molarity of Tris = 100 mM = 0.1 M

volume of Tris sol. = 100 mL = 0.1 L

molar mass of Tris = 121.1 g/mol

Hence,

mass of Tris = Molarity of Tris x molar mass ofTris x volume of Tris solution

= 0.1 M x 121.1 g/mol x 0.1 L

= 1.211 g

mass of Tris = 1.211 g


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