Answer:
Explanation:
You calculate the energy required to break all the bonds in the reactants.
Then you subtract the energy needed to break all the bonds in the products.
CH₃CH₂OH + 3O₂ ⟶ 2CO₂ + 3H₂O
Bonds: 5C-H 1C-C 1C-O 1O-H 3O=O 4C=O 6O-H
D/kJ·mol⁻¹: 413 347 358 467 495 799 467
Answer:
Explanation:
Method 1 proportion
1 mole of chromium is 52 grams
11.9 moles = x grams
1/11.9 = 52/x Cross multiply
x = 11.9 * 52
x = 618.8 grams
Now I have used an approximate mass for Chromium. The answer you get here is expected to reflect the weigth given on your periodic table Use that to get your answer. You should give a number very close to mine. Round to 3 places as in 619.
Method Two Formula
mols = given mass / molecular mass
11.9 = given mass / 51.9961 Multiply both sides by 51.9961
11.9 *51.9961 = given mass
given mass = 618.75
given mass = 619
Significant figures are numbers that are higher than 0, and before the decimal.
For example:
12.0, there are only 2 significant figures: 1 and 2. Since 0 is not higher than itself and is after the decimal, it is not a significant figure. Trailing 0’s are not significant. Only zeros that are in between a number are considered significant.
For example: 302 has 3 significant figures.
1
1
11
qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq
Based on the properties of minerals, the following are true:
- Fluorite can de distinguished from quartz based on Color and Hardness.
- Solubility is not a property of minerals.
<h3>Properties of minerals</h3>
- Hardness - minerals can be differentiated based their resistance to be scratched.
- Cleavage - the way minerals break up.
- Color - minerals has different colors but this is not often a reliable property.
Flourite and Quartz have different colors and hardness with Quartz being harder than flourite.
In conclusion, solubility is not a mineral property.
Find out more properties of minerals at brainly.com/question/690965.