Answer:
Mass of Cu(NO₃)₂ produced = 125.67 g
limiting reactant = Cu
Explanation:
Given data:
Mass of Cu = 42.6 g
Mass of HNO₃ = 84.0 g
What is limiting reactant = ?
Mass of Cu(NO₃)₂ produced = ?
Solution:
Chemical equation:
3Cu + 8HNO₃ → 3Cu(NO₃)₂ + 4H₂O + 2NO
Number of moles of Cu:
Number of moles = mass/ molar mass
Number of moles = 42.6 g/63.546 g/mol
Number of moles = 0.67 mol
Number of moles of HNO₃:
Number of moles = mass/ molar mass
Number of moles = 84 g/63.01 g/mol
Number of moles = 1.3 mol
Now we will compare the moles of Cu(NO₃)₂ with HNO₃ and Cu from balance chemical equation.
HNO₃ : Cu(NO₃)₂
8 : 3
1.3 : 3/8×1.3 = 6
Cu : Cu(NO₃)₂
3 : 3
0.67 : 0.67
Number of moles of Cu(NO₃)₂ produced by Cu are less so Cu will limiting reactant.
Mass of Cu(NO₃)₂:
Mass = number of moles × molar mass
Mass = 0.67 mol × 187.56 g/mol
Mass = 125.67 g
Based on the trend of electronegativities values of the elements <em>Be, Mg, Ca, </em>and,<em> Sr</em> within their group (increasing from bottom to top), the atoms of the element Sr will have the <u>least attraction</u> for an electron.
We need to remember that electronegativity indicates the affinity or attraction of an element for an electron. Hence, the <u>higher</u> the <em>electronegativity,</em> the<u> higher</u> the <em>attraction </em>of that element for an <em>electron</em>.
The values of <em>electronegativities </em>of the given <em>elements </em>are the following:
Be = 1.57
Mg = 1.31
Ca = 1.0
Sr = 0.95
We can see that the increasing trend of <em>electronegativities </em>in this group is from the <u>bottom to the top</u>, having the Sr with the lowest electronegativity value and the <em>Be</em> with the <em>highest</em>.
This trend is related to atomic size, the <u>larger</u> the <em>atomic size</em>, the <u>lower</u> the <em>electronegativity</em> because the <em>electron </em>in the outermost shell will feel <u>less attraction</u> towards the nucleus of an atom. In a group of the periodic table, the <em>size </em>of an <em>atom </em>will <em>increase </em>from <u>top to bottom</u>.
Therefore, according to the said above, the atoms of the Sr will have the least attraction for an electron (it has the lower electronegativity value).
Find more about electronegativity here:
I hope it helps you!
A. Atoms. Because I learned this in 6th grade.
Orbital
All atoms have the same number of electrons as protons. Negative electrons are attracted to the positive nucleus. This force of attraction keeps electrons constantly moving around the nucleus. The region where an electron is most likely to be found is called an orbital.
Here you go :)
Answer:
C(s)+CO₂(g)→2CO(g)
Explanation:
Basically you’re adding the compounds until they’re equal on both sides