Answer:
Explanation:
First convert the grams of Calcium Bromide to moles by using the atomic weight. Then use the formula for molarity, which is moles per liter.
CaBr2 = 199.9 g/mol
10/199.9 = 0.05 moles of CaBr2
x = 0.1L or 100mL
Answer:
The answers to your questions are given below.
Explanation:
1. __H₂ + __O₂ —> __H₂O
The above equation can be balance as follow:
H₂ + O₂ —> H₂O
There are 2 atoms of O on the left side and 1 atom on the right side. It can be balance by writing 2 before H₂O as shown below:
H₂ + O₂ —> 2H₂O
There are 2 atoms of H on the left side and a total of 4 atoms on the right side. It can be balance by writing 2 before H₂ as shown below:
2H₂ + O₂ —> 2H₂O
Now the equation is balanced.
Elements >>> Reactants >>> Products
H >>>>>>>>> 4 >>>>>>>>>>> 4
O >>>>>>>>> 2 >>>>>>>>>>> 2
2. __ P₄ + __O₂ —> __P₂O₃
The above equation can be balance as follow:
P₄ + O₂ —> P₂O₃
There are 4 atoms of P on the left side and 2 atoms on the right side. It can be balance by writing 2 before P₂O₃ as shown below:
P₄ + O₂ —> 2P₂O₃
There are 2 atoms of O on the left side and a total of 6 atoms on the right side. It can be balance by writing 3 before O₂ as shown below:
P₄ + 3O₂ —> 2P₂O₃
Now, the equation is balanced
Elements >>> Reactants >>> Products
P >>>>>>>>> 4 >>>>>>>>>>> 4
O >>>>>>>>> 6 >>>>>>>>>>> 6
The doctor required a 15% 750mL solution. To lower the concentration of the solution, you have to add more diluting liquid.
750mL * 0.15 = 112.5mL. This 112.5mL signifies the pure chemical or compound in the solution. This 112.5mL can be taken from the stock solution.
112.5 * 2 = 250mL of stock solution would be needed and 500 mL of the diluting agent should be added. Adding the two together would result to a 750mL solution of 15% concentration.
I believe the charge is positive as losing an electron suggests that the atom lost a negative charge, leaving it with more positive than negative.
I haven't taken this in a few years very sorry if i'm wrong tho.
Answer:
The final temperature is 800KPa
Explanation:
The following were obtained from the question:
P1 = 200 kPa
T1 = 100 K
T2 = 400 K
P2 =?
Since the tank is rigid, the volume of the tank is constant.
Using P1/T1 = P2/T2, we can obtain the new pressure as illustrated below:
200/100 = P2 /400
Cross multiply to express in linear form:
100 x P2 = 200 x 400
Divide both side by 100
P2 = (200 x 400) /100
P2 = 800KPa
The final temperature is 800KPa
