Answer:
A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.
The best and most correct answer among the choices provided by your question is the second choice or letter B.
<span>The most accurate measurement based on the limitations of the balance that might be found in her recorded data would be 9.2</span>
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I can’t really understand your question sorry
Answer: STP
CaCO3 = 5 g
Convert gram to mol
100 g of CaCO3 = 1 mol
5 g of CaCO3 (n) = 5 g *(1 mol/100 g) = 0.05 mol
Gas law
PV =nRT
V = nRT/P
V = (0.05 mol * (0.08206 L atm /K mol) *273 K)/1 atm
V = 1.124 L
Explanation:
The theoretical yield of HCl produced is 56.06 grams of HCl
<u><em>calculation</em></u>
BCl₃(g) +3 H₂O(l) → H₃BO₃(s) + 3 HCl(g)
Step 1: find the moles of each reactant
moles = mass÷molar mass
moles of BCl₃ = 60.0 g÷117.16 g/mol =0.512 moles
moles of H2O = 37.5 g ÷18 g/ mol = 2.083 moles
Step 2: use the moles ratio to determine the limiting reagent
from the equation above BCl₃ :HCl is 1:3 therefore the moles of HCl = 0.512 moles x 3/1 =1.536 moles
H2O :HCl is 3:3 = 1:1 therefore the moles of HCl is also 2.083 moles
Bcl₃ is the limiting reagent since it produces less amount of HCl therefore the moles HCl is 1.536 moles
Step 3 ; find the theoretical yield
The theoretical yield = moles x molar mass
from periodic table the molar mass of HCl = 1+ 35.5= 36.5 g/mol
Theoretical yield= 1.536 moles x 36.5 g/mol =56.06 g of Hcl