Answer:
72.57 grams
Explanation:
The mass percentage of gold in the ore is 0.19 %
The mass of ore used = 23 kg
The mass of gold in the ore = 
moles of gold in the given mass of ore =
As per given equation four moles of Au is giving four moles of complex compound on reacting with NaCN
Then in second reaction two moles of the complex is reacting with one mole of Zinc
Thus two moles of gold are reacting with one mole of Zinc
The moles of Zinc needed = 0.5 X 2.22 mol = 1.11 moles
The mass of Zinc needed = moles X atomic mass =1.11 X 65.38 = 72.57 grams
Answer:
The chemical reaction between the citric acid and sodium bicarbonate
Explanation:
Answer:
Dalton's theory are based on the two laws that are: Law of conservation of mass and law of constant composition. This theory basically described their properties of atoms.
This theory state that all the atoms are made up of matter which are invisible and in the elements all the atoms are identical in mass and properties.
Answer:
Average atomic mass of uranium = 237.97 amu
Explanation:
Given data:
Abundance of U-234 = 0.01%
Abundance of U-235 = 0.71%
Abundance of U-238 = 99.28%
Average atomic mass of uranium = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100
Average atomic mass = (234×0.01)+(235×0.71)+(238+99.28) /100
Average atomic mass = 2.34 + 166.85+23628.64 / 100
Average atomic mass = 23797.83 / 100
Average atomic mass = 237.97 amu.
12, if the decimal is over five, round up. If it's not, round down. Not sure what you mean by significant figures.
