Answer:
172 g
Explanation:
Let's consider the reduction of Au³⁺ to Au.
Au³⁺(aq) + 3 e⁻ → Au(s)
In order to find the mass of gold produced, we will use the following relations.
- 1 min = 60 s
- 1 A = 1 C/s
- The charge of 1 mole of electrons is 96,468 C (Faraday's constant).
- 1 mole of Au is deposited when 3 moles of electrons circulate.
- The molar mass of Au is 196.97 g/mol.
The mass of gold produced when 15.1 A of current are passed through a gold solution for 31.0 min is:
Step 1 - Since 3.3mm^3 = 0.0033cm^3, convert that to 3.3x10^-3 cm^3.
Step 2 - Since 1cm^3 = 1x10^-6 m^3, times 3.3 by that. (3.3 x 1 x 10^-6) = 0.0000033
Step 3 - 0.0000033 = 3.3 x 10 ^-6 m^3, which is your answer choice A.
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Answer:
Explanation:
1. Boiling point
The boiling point of a substance especially a fluid, is that temperature at which it turns from liquid to gas. The boiling point of water for example is 100°C, at this temperature, liquid water changes to vapor which a gaseous form of water.
2. decrease
When the size of a sample increases, the surface area of the sample decreases and so also the solubility. Smaller sized samples have a large surface area through which the solvent can readily surround and dissolve a material. Larger sized particles on the other hand have low surface area and dissolves slowly than expected.
3. Wood has low thermal conductivity, and metal has high thermal conductivity.
The thermal conductivity of wood is very low while that of metals is very high. This why metals will conduct heat away from a heat source and a wood will remain unchanged in terms of temperature.
4. Volume
Volume is an extensive property of a matter that depends on the amount of substance present. Volume is the amount of space a substance occupies. The more the substance, the more the space it occupies. This why 20g of water will have a higher volume compared to 15g of water.
5. Solvent
A solvent is a liquid that dissolves other substances. When solvents dissolves other substances, they form a solution.
The finished punnet square will look like this. G is green (dominant) and g is yellow (recessive).
<u>G</u> <u>g</u>
<u>g</u> Gg gg
<u>g</u> Gg gg
If at least 1 dominant genotype is expressed, the offspring will have the dominant trait. Only if 2 recessive genotypes are present will the offspring have the recessive trait. This means that 2/4 or 50% of the offspring will be green and 2/4 or 50% of the offspring will be yellow.
Hope this helps!
A reaction in which Oxygen (O₂) is produced from Mercury Oxide (HgO) would be a decomposition reaction.
2HgO → 2Hg + O₂
If 250g of O₂ is needed to be produced,
then the moles of oxygen needed to be produced = 250g ÷ 32 g/mol
= 7.8125 mol
Now, the mole ratio of Oxygen to Mercury Oxide is 1 : 2
∴ if the moles of oxygen = 7.8125 mol
then the moles of mercury oxide = 7.8125 mol × 2
= 15.625 mol
Thus the number moles of HgO needed to produce 250.0 g of O₂ is 15.625 mol