The balanced chemical reaction is as follows:
<span>2NH3 + 5/2O2 ----> 2NO + 3H2O
We are given the amount of the reactants to be used in the experiment. We use these values to determine the limiting reactant. We calculate as follows:
3.25 g NH3 ( 1 mol / 17.04 g ) = 0.191 mol NH3
3.50 g O2 ( 1 mol / 32 g ) = 0.109 mol O2
If we have 0.191 mol NH3, then to be able to react completely we need 0.23875 mol of O2. As we can see, O2 is not enough. Therefore O2 would be the limiting reactant since it is all being used up in the reaction.</span>
Answer:
A. 100 g of this solution contains 39 g of phosphoric acid
Explanation:
The formular for percentage by a mass id usually given as;
( Mass of element / Mass of compound ) * 100%
So when a solution contains 39% by mass of phosphoric acid, it means that in 100 units of the solution, there are 39 units of phosphoric acid.
The only option that satisfies this is option A. 100 g of this solution contains 39 g of phosphoric acid
Answer:
True
Explanation:
Electrons that are in the first energy level (energy level 1) are closest to the nucleus and will have the lowest energy. Electrons further away from the nucleus will have higher energy. An atom's electron shell can accommodate 2n2 electrons, where n is the energy level.
Your answer would be C. Alpha decay involves the ejection of 2 protons and 2 neutrons from the nucleus for a total of 4 amu lost. This form of decay is most common in heavy elements.
