It is OH- (hydroxide ion)
a. We first calculate the moles of sucrose needed
moles sucrose = 0.250 M * 0.25 L
moles sucrose = 0.0625 mol
The molar mass of sucrose 342.3 g/mol, so the mass of
sucrose needed is:
mass sucrose = 0.0625 mol * 342.3 g/mol
mass sucrose = 21.4 grams
So simply dissolved about 21.4 grams of sucrose in 250 mL
solution.
b. We use the formula:
M1 V1 = M2 V2
1.50 M * V1 = 0.100 M * 0.350 L
V1 = 0.0233 L = 23.3 mL
So simply take 23.3 mL of solution from 1.50 M then dilute
it with water until 350 mL to make 0.100 M.
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Answer:
unchanged
Explanation:
In any chemical of physical process, energy is neither created nor destroyed. A process that absorbs the heat from the surroundings. ... What happens to the energy of the universe during a chemical or physical process? During any chemical or physical process, the energy of the universe remains unchanged.
Light will travel 9.4525 × 10¹⁷ centimeters in one year.
Explanation:
Knowing that 1 year have 3.154 × 10⁷ seconds, we devise the following reasoning:
if light travels 2.9970 × 10¹⁰ centimeters in 1 second
then light travels X centimeters in 3.154 × 10⁷ seconds
X = (2.9970 × 10¹⁰ × 3.154 × 10⁷) / 1 = 9.4525 × 10¹⁷ centimeters
Learn more about:
speed of light
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