A(n) _____ is a compound that produces hydrogen ions when dissolved in water.
2 answers:
Answer: a. acid
Explanation:
a. Acids are those substances which either donates hydrogen ions when dissolved in water or accepts a pair of electrons.
b. Buffer is a solution which resist changes in pH on addition of small amounts of acid or base into it.
c. Bases are those substances which either donates hydroxide ions when dissolved in water or donates a pair of electrons.
d. Indicators are chemical compounds which show a change or appearance in color at particular pH. Example: litmus
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Answer:
15.9 g
Explanation:
(Take the atomic mass of C=12.0, H=1.0, O=16.0)
no. of moles = mass / molar mass
no. of moles of octane used = 11.2 / (12.0x8 + 1x18)
= 0.0982456 mol
Since oxygen is in excess and octane is the limiting reagent, the no. of moles of H2O depends on the no. of moles of octane used.
From the balanced equation, the mole ratio of octane : water = 2:18 = 1: 9,
so this means, one mole of octane produced 9 moles of water.
Using this ratio, we can deduce that (y is the no. of moles of water produced):
y = 0.0982456x9
y= 0.88421 mol
Since mass = no. of moles x molar mass,
mass of water produced = 0.88421 x (1.0x2+16.0)
=15.9 g