Answer:
malleable, strong, good conductor, ductile, shiny
Explanation:
Answer: Percent yield represents the ratio between what is experimentally obtained and what is theoretically calculated, multiplied by 100%.
% yield
=
actual yield
theoretical yield
⋅
100
%
So, let's say you want to do an experiment in the lab. You want to measure how much water is produced when 12.0 g of glucose (
C
6
H
12
O
6
) is burned with enough oxygen.
C
6
H
12
O
6
+
6
O
2
→
6
C
O
2
+
6
H
2
O
Since you have a
1
:
6
mole ratio between glucose and water, you can determine how much water you would get by
12.0
g glucose
⋅
1 mole glucose
180.0 g
⋅
6 moles of water
1 mole glucose
⋅
18.0 g
1 mole water
=
7.20
g
This represents your theoretical yield. If the percent yield is 100%, the actual yield will be equal to the theoretical yield. However, after you do the experiment you discover that only 6.50 g of water were produced.
Since less than what was calculated was actually produced, it means that the reaction's percent yield must be smaller than 100%. This is confirmed by
% yield
=
6.50 g
7.20 g
⋅
100
%
=
90.3
%
You can backtrack from here and find out how much glucose reacted
65.0 g of water
⋅
1 mole
18.0 g
⋅
1 mole glucose
6 moles water
⋅
180.0 g
1 mole glucose
=
10.8
g
So not all the glucose reacted, which means that oxygen was not sufficient for the reaction - it acted as a limiting reagent.
Explanation:
The average atomic mass of this new element X is 43.45
HOW TO CALCULATE AVERAGE ATOMIC MASS:
- The average atomic mass of an element can be calculated by the following steps:
- multiplying the atomic mass of each isotope with its relative abundance
- Then sum the results for each isotope
According to this question; a new element X is found and in the sample:
- 70% is X-43
- 25% is X-44
- 5% is X-47
The average atomic mass of element X is calculated thus:
X-43: 70/100 × 43 = 30.1
X-44: 25/100 × 44 = 11
X-47: 5/100 × 47 = 2.35
Next, we sum the results as follows:
= 30.1 + 11 + 2.35
= 43.45
- Therefore, the average atomic mass of this new element X is 43.45.
Learn more: brainly.com/question/13753702?referrer=searchResults
Answer:
Which question or all of them?
