The percentage composition of a given compound is defined as the ratio of the amount of each element to the total amount of individual elements present in the compound multiplied by 100
= 34.79 %
Answer:
The addition of nutrients to water by human activity is called artificial Eutrophication. Nonpoint-source-pollution comes from many small sources.
Explanation:
hope this helps :)
Answer
mass of aluminum metal= 7 .0497g of Al
Explanation:
current = 21 A
time = 1 hour = 60 X 60 = 3600 s
quantity of electricity passed = current X time = 21X 3600 = 75600 C
Following the electrolysis the below reaction will occur :
Al3+ + 3e- --------> Al
therefore, 3F i.e. 3 X 96500 C = 289500 C gives 1 mole of Al
so 1 C will produce 1/289500 moles of Al
so 108000 C will produce 1/289500 X 75600 = 0.2611 moles of Al
now 1 mole of aluminium weighs = 27 g/mole
so 0.2611 moles of Al = 0.2611 X 27 = 7 .0497 g
mass of aluminum metal= 7 .0497 g of Al
We would be dead. No heart, brain or blood flow <span />
Answer:
216.0cm³ of ore must be processed
Explanation:
First, we need to know how many grams of gold we need to obtain $100.00
<em>Mass of gold to obtain $100.00:</em>
$100.00 gold * (1 troy oz / $818) = 0.122 troy oz
0.122 troy oz * (1.0lb / 14.6troy oz) = 8.37x10⁻³ lb
8.37x10⁻³ lb * (454g / 1lb) =
3.80g of gold we need to obtain $100.00
Now, the ore contain 0.22g of gold in 100g and the density of the ore is 8.0g/cm³. We can solve the cubic centimeters to obtain $100.00:
<em>Cubic centimeters of ore:</em>
3.80g Gold * (100g Ore / 0.22g Gold) = 1727.9g of Ore
1727.9g Ore * (1cm³ / 8.0g Ore) =
<h3>216.0cm³ of ore must be processed</h3>
