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Gold is extracted from its ores by treatment with an aqueous cyanide solution, which causes a reaction that forms the soluble [Au(CN) 2] − ion. Gold is then recovered by reduction with metallic zinc according to the following equation: \[ Zn(s) + 2[Au(CN)_2]^-(aq) \rightarrow [Zn(CN)_4]^{2-}(aq) + 2Au(s) \nonumber \]
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However, there are two NH 4 + ions per formula unit, so the...
- Solutions and Dilutions
The Fundamental Principle of Fractions \[\frac{2}{3}=\frac{2 \cdot 4}{3 \cdot 4}=\frac{8}{12}\nonumber\] That is, as long as you multiply both numerator and denominator by the same number, the fraction value does not change, and you obtain equivalent fractions.
11 Μαρ 2023 · A gold ore with a concentration of 0.060 g / cm 3 has a density of 8.25 g / cm 3. What is the volume of gold (D = 19.32 g / cm 3) in 100 cm 3 of the ore? Answer. The volume of 100 g of ore is \(\text{V} = \dfrac{m}{D} = \dfrac{100 g}{8.25 g/cm^3} = \text{12.12 cm}^3\) The mass of gold in this volume is
Find the length of the shorter segment and label it b. Compute a/b. If the proportion is (approximately) equal to 1.618, your segments are in golden proportion. You can also use Omni's golden ratio calculator to do the job.
Decimal to Fraction Calculator. Shows the steps to convert a decimal number to its equivalent fraction.
A Quick Way to Calculate. That rectangle above shows us a simple formula for the Golden Ratio. When the short side is 1, the long side is 1 2+√5 2, so: φ = 1 2 + √5 2. The square root of 5 is approximately 2.236068, so the Golden Ratio is approximately 0.5 + 2.236068/2 = 1.618034.
1. Convert the following fractions to a decimal number. a) (to the nearest hundredth) = 0.83 f) (to the nearest hundredth) = 1.21 b) 3 (to the nearest hundredth) = 3.88 g) (exactly) = 3 c) (exactly) = 0.04 h) (exactly) = 6 d) (exactly) = 3.5 i) (to the nearest thousandth) = 5.54 e) (to the nearest hundredth) = 4.33 j) (exactly) = 38.95 2.
