Your question is incomplete. However, I found a similar problem fromanother website as shown in the attached picture.
To solve this problem, you must know that at STP, the volume for any gas is 22.4 L/mol. So,
Moles O₂: 156.8 mL * 1 L/1000 mL* 1 mol/22.4 L = 0.007 moles
Mass calcium: 0.007 mol O₂ * 2 mol Ca/1 mol O₂ * 40 g/mol Ca =
<em> 0.56 g Ca</em>
Answer:
(a) 4 %; (b) 5 %
Explanation:
We need a Cu-Ag phase diagram to answer these questions (see diagram). Yours may differ slightly from the one I used.
(a) Cu in Ag
The horizontal red line at 700 °C cuts the right-hand solvus at about 4 % Ag-96 % Cu.
At this point, copper is in equilibrium with the eutectic.
At 700 °C, the maximum solubility of Cu is about 4 % by mass.
(b) Ag in Cu
The horizontal red line at 700 °C cuts the left-hand solvus at about 5 % Cu-95 % Ag.
At this point, silver is in equilibrium with the eutectic.
At 700 °C, the maximum solubility of Ag is about 5 % by mass.
The answer for the following answer is mentioned below.
- Therefore the mass of calcium nitrate (
Explanation:
To find the mass of calcium nitrate ( ) is :
No of calcium are 1
No of nitrogen are 2
No of oxygen are 6
= 
So therefore;
No of nitrogen are 2
No of oxygen are 6
Mass of ( ) :
molecular mass of calcium =40
molecular mass of nitrogen = 14
molecular mass of oxygen = 16
= (14×2) + (16×6)
= 28 + 96
= 124
= 40 + 124
<u><em></em></u><u><em> = 164 grams</em></u>
Therefore the mass of calcium nitrate ( ) is 164 grams
Answer:
In this case the mass number would be 11.
Explanation:
The mass number of an element is the sum of the protons and neutrons. The number of neutrons for a given element is the only number that can change and still have the identity of the element stay the same, (because the atomic number is the number of protons).
Answer:
1: Killing a specific gene.
2: augmentation of a gene.
3: Inserting a new dominant gene.
Explanation:
