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PtichkaEL [24]
3 years ago
6

Someone pls help with this

Chemistry
1 answer:
Anettt [7]3 years ago
5 0
Question 3 is uniformitarianism
Question 4 is sedimentary rock
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How many formula units are in<br> 35.0 g KNO3?<br> (KNO3, 101.11 g/mol)<br><br> [?]×10¹²] fun KNO3
alina1380 [7]

mol=35:101.11 g/mol=0.346

formula units = 0.346 x 6.02 x 10²³ = 2.082 x 10²³

3 0
2 years ago
Urgent!! A chemist measured 5.2 g copper(II) bromide tetrahydrate (CuBr2•4(H2O)). How many moles were measured out? Answer in un
bezimeni [28]
  The  moles  which  were   measured  out  is  calculated  using  the  following  formula

moles  =  mass/molar   mass

molar mass  of  CuBr2.4H20  =   63.5  Cu + (  2  x79.9)  br  + ( 18  x4_)  h20  =  295.3  g/mol

moles  is therefore=  5.2 g/  295.3 g/mol=  0.0176 moles
4 0
2 years ago
Read 2 more answers
-
Alchen [17]

Answer:

T₂  = 84.375 K

Explanation:

Given data:

Initial volume = 3.3 L

Initial pressure = 2000 torr

Initial temperature = 225 K

Final temperature = ?

Final volume = 2.75 L

Final pressure = 900 torr

Formula:

P₁V₁/T₁ = P₂V₂/T₂  

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume

T₂ = Final temperature

Solution:

P₁V₁/T₁ = P₂V₂/T₂  

T₂  = P₂V₂ T₁ /P₁V₁

T₂  = 900 torr× 2.75 L× 225 K / 2000 torr×3.3 L

T₂  = 556875 K/ 6600

T₂  = 84.375 K

7 0
3 years ago
What is the purpose of the solvent in chromatography?
prisoha [69]
Solid substances cannot raise to the top of the ‘card’. They need to be in liquid form.
5 0
2 years ago
Nomenclature of calcium chloride​
Umnica [9.8K]

Answer:

CHEBI:3312 - calcium dichloride

Explanation:

Calcium chloride is an inorganic compound, a salt with the chemical formula CaCl2.

7 0
3 years ago
Read 2 more answers
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