Explanation:
Claim, Evidence, Reasoning (CER) model, an explanation consists of: A claim that answers the question. Evidence from students' data. Reasoning that involves a rule or scientific principle that describes why the evidence supports the claim.
A) 7.5 % m / V
7.5 g -------- 100 mL ( solution )
mass g ------ 45.0 mL
mass g = 45.0 x 7.5 / 100
mass g = 337.5 / 100 => 3.375 g
1 mole KCl -------------- 74.55 g
moles KCl ---------------- 3.375 g
moles KCl = 3.375 x 1 / 74.55 => 0.0452 moles of KCl
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b) 9.5 % ( m / V ) :
9.5 g -------- 100 mL ( solution )
mass g ------ 400.0 mL
mass g = 400.0 x 9.5 / 100
mass g = 3800 / 100 => 38 g
1 mole acetic acid -------------- 60.05 g
moles acetid acid ---------------- 38 g
moles acetid acid = 38 x 1 / 60.05 => 0.6328 moles of acetid acid<span>
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hope this helps!
There is no hydrogen in ammonium sulfide it is just 1 ammonium and 1 sulfer
<span>Endothermic Reaction. This reaction or process absorbs energy from its surroundings, mostly, but will not always be, in form of heat. A reaction that requires the input of energy that breaks a bond will always be endothermic. Best examples of endothermic reaction are: 1) melting cubes; 2) evaporating of liquid; 3) melting solid salts, etc.</span>
