Answer:
2KClO3 ==> 2 KCl + 3O2
393g O2 x 1 mole/32 g = 12.28 moles O2
moles KClO3 needed = 12.28 mol O2 x 2 mol KClO3/3mol O2 = 8.19 mol
grams KClO3 = 8.19 moles x 123g/mol = 1007g
Explanation:
I’m assuming this means mass percent, because that is typical of these types of problems. The substance with the highest mass percent of Br would be the one where the molar mass of Br over the molar mass mass of the substance has the highest value. This would require the other component of the substance to have as small of a molar mass as possible, and by inspection of the periodic table, it is evident that this would be lithium, which has a molar mass of 6.941 amu rather than potassium’s 39.10 or cesium’s 132.91. This means that the correct answer should be C. LiBr.
Answer:
Cellular respiration is the process of using oxygen in the mitochondria to chemically break down organic molecules such as glucose to release the energy stored in its bonds. In the process molecules of water and carbon dioxide are released as waste products
Explanation:
Answer:
0.02564 kg ore contain 10.0 g of nickel.
Explanation:
Given data:
Percentage of nickel in ore = 39.0%
Mass of ore required to have 10 g of nickel = ?
Solution:
39.0% means that 39.0 g of nickel is present in 100 g of ore thus,
39/100 = 0.39
0.39 × X = 10.0 g
X = 10.0 g/0.39
X = 25.64 g
Gram to kilogram:
25.64 g × 1kg /1000 g
0.02564 kg
Atomic percentages<u>: 68% of copper and 32% of nickel.</u>
How this is calculated?
The given alloy is 100 g ,
m(Cu) = 0,7 · 100 g = 70 g.
m(Ni) = 0,3 · 100 g = 30 g.
n(Cu) = m(Cu) ÷ M(Cu) = 70 g ÷ 63,546 g/mol
n(Cu) = 1,10 mol.
n(Ni) = m(Ni) ÷ M(Ni) = 30 g ÷ 58,71 g/mol
n(Ni) = 0,51 mol
n(Cu) : n(Ni) = 1,10 mol : 0,51 mol
%(Cu) = 1,1 mol ÷ 1,61 mol = 0,68 = 68 %.
Similarly, %(Ni)=32%
What are Cu-Ni alloys?
- Cu-Ni alloys are alloys of copper (base metal with the largest individual content) and nickel with or without other elements, whereby the zinc content may not be more than 1%.
- When other elements are present, nickel has the largest individual content after copper, compared with each other element.
- As with other copper alloys, it is necessary to distinguish between wrought alloys, which are processed to semi-finished products, and cast alloys, from which castings are produced by various casting processes.
To know more about Cu-Ni alloys, refer:
brainly.com/question/16856761
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