Answer:
a -4
b - 8
c - 5
d 2
Explanation:
Significant Figures: The number of digits used to express a measured or calculated quantity. By using significant figures, we can show how precise a number is. ... Accuracy: Refers to how closely individual measurements agree with the correct or true value.
The answer is Q because the red it's absorbed by object Q meaning only black will show
Answer: The correct option is, (B) 12.3 KJ
Solution :
First we have to calculate the moles of water.
Now we have to calculate the amount of heat released.
Formula used :
where,
q = heat released
n = number of moles = 2.04 mole
= molar enthalpy of fusion of a substance = -6.01 KJ/mole
Now put all the give values in the above formula, we get the amount of heat released.
The negative sign indicate heat released.
Therefore, the amount of heat released is, 12.3 KJ
Strong acids: if its a strong acid, it will separate completely in water, meaning that the H+ ion concentration in the water will increase, which in turn causes the pH to decrease
example: HCl -> H+ + Cl-
Weak acids: weak acids don't separate completely in water, but because they are acids, they still separate. You can figure out how much of the acid has broken up by using a rice table and looking up the Ka.
We are given with
V = <span>2.394 x 102 mL
P = </span><span>7.20 x 102 mm of Hg
T = </span><span>78 oC
We are asked to determine the mass of the sample in milligrams
Using the ideal gas law
n = PV / RT
n = </span>7.20 x 102 mm of Hg (2.394 x 102 mL) / R (78 + 273)
Use the appropriate value for R or just convert the values to SI and use R = 8.314
Then, solve for the mass of the sample by using the MW Oxygen which is 16 g/mol
