Answer:
0.36 M
Explanation:
Let's consider the following neutralization reaction.
HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l)
25 mL of 0.83 M NaOH reacted. The moles of NaOH that reacted are:
0.025 L × 0.83 mol/L =0.021 mol
The molar ratio of NaOH to HCl is 1:1. The moles of HCl that reacted are 0.021 moles.
0.021 moles are contained in 58 mL of HCl. The molar concentration of HCl is:
M = 0.021 mol/0.058 L
M = 0.36 M
Answer:
293 grams Fe₂S₃(s)
Explanation:
16Fe(s) + 3S₈(s) => 8Fe₂S₃(s)
Excess | 1.25 mole | ? grams
moles Fe₂S₈ produced = 8/3(1.25) mole Fe₂S₃(s) Yield = 3.33 mole Fe₂S₃(s)
∴ grams of Fe₂S₈ = 3.33 mole x 88 g/mole = 293 grams Fe₂S₃(s)
Answers:
1. 7500 J; 3800 J/g
Step-by-step explanation:
1. Joules gained by water
q = mcΔT
Data:
m = 100 g
C = 4.184 J·°C⁻¹g⁻¹
ΔT = 18 °C
Calculation:
q = 100 × 4.184 × 18 =7500 J
2. Joules per gram of Pringle
Energy gained by water = energy lost by Pringle
q = -mΔH
7500 J = -1.984 g × ΔH
ΔH = -7500 J/1.984 g = -3800 J/g
Pringles contain 3800 J of food energy per gram.
A heterogeneous mixture is one that is not evenly mixed
A homogeneous mixture is one that is evenly mixed
im pretty sure the answer you are looking for is relative though because mixtures do not have a fixed composition
