Density = mass/volume
Density = 81g/0.9cm³
Density = 90g/cm³
: )
<u>Answer:</u>
Now it is given here that there are 325 tubes that are manufactured for sunscreen. And we also know that the percentage of sunscreen in benzyl salicylate is 2.5% here in one tube we have 2 Oz of sunscreen.
<u>Explanation:</u>
So sunscreen in 325 tubes will be 2 x 325= 650 Oz. Since we know the amount of sunscreen in 325 tubes the amount of Benzyl salicylate in all 325 tubes will be 650 x 0.025 = 16.25 Oz
<em>Now this can be converted into kg as 0.46 kg</em>.
He was looking at Uranium Salts<span />
Answer:
Kₐ = 4.06 × 10⁻⁷
Explanation:
Step 1. <em>Calculate [H₃O⁺]
</em>
pH = 3.94
[H₃O⁺] = 1.15 × 10⁻⁴ mol·L⁻¹
Calculate 
HF + H₂O ⇌ H₃O⁺ + F⁻
I/mol·L⁻¹: 0.0326 0 0
C/mol·L⁻¹: 0.0326-1.15 × 10⁻⁴ +1.15 × 10⁻⁴ +1.15 × 10⁻⁴
E/mol·L⁻¹: 0.0325 1.15 × 10⁻⁴ 1.15 × 10⁻⁴
So, at equilibrium,
[H₃O⁺] = [F⁻] = 1.15 × 10⁻⁴ mol·L⁻¹
[HF] = 0.326 – 1.15 × 10⁻⁴ mol·L⁻¹ = 0.0325 mol·L⁻¹
Kₐ = {[H₃O⁺][F⁻]}/[HF]
Kₐ = (1.15 × 10⁻⁴ × 1.15 × 10⁻⁴)/0.0325
Kₐ = 1.32 × 10⁻⁸/0.0325
Kₐ = 4.06 × 10⁻⁷
This is <em>NOT</em> a solution of HF (Kₐ = 7.2 × 10⁻⁴). It is more likely a solution of carbonic acid (H₂CO₃; Kₐ₁ = 4.27 × 10⁻⁷).
Answer: 1) A. It is the site of photosynthesis, where glucose is produce.
2) C. The large vascuole is like a water-filled balloon. When the plant is water-stressed, the water leaves the vacuole and the cells shrink.
