Answer:
Trial Number of moles
1 0.001249mol
2 0.001232mol
3 0.001187 mol
Explanation:
To calculate the <em>number of moles of tritant</em> you need its<em> molarity</em>.
Since the<em> molarity</em> is not reported, I will use 0.1000M (four significant figures), which is used in other similar problems.
<em>Molarity</em> is the concentration of the solution in number of moles of solute per liter of solution.
In this case the solute is <em>NaOH</em>.
The formula is:
Solve for the <em>number of moles:</em>
Then, using the molarity of 0.1000M and the volumes for each trial you can calculate the number of moles of tritant.
Trial mL liters Number of moles
1 12.49 0.01249 0.01249liters × 0.1000M = 0.001249mol
2 12.32 0.01232 0.01232liters × 0.1000M = 0.001232mol
3 11.87 0.01187 0.01187liters × 0.1000M = 0.001187 mol
<span>Answer:
3 electron pairs
Let's take BF3 for an example.
When you find the valence electrons for this molecule --> [3+(3x6)], you'll get 24e-. You draw the Lewis dot structure and each of the F atom would have six dots around it (a total of 18 because there's 3 F atoms) and the B would have three lines [one line attached to each F. One line would equal to 2 valence electrons] and you get a total of 24 valence e-.
The question asks how many groups are on the CENTRAL atom, meaning on the B. It would be three</span>
Answer:
Nickle
Explanation:
In statement it is given that the metal "M" has a formula "MCl₂" which means it has a charge of +2 as each Chlorine atom has -1 charge. Therefore, it is cleared that this metal has lost 2 electrons and originally it was carrying 28 electrons.
After that periodic table is concerned and a metal with 28 atomic number was tracked because a neutral atom with 28 electrons must have 28 protons and protons are infact the atomic number.
Hence, in periodic table the metal with 28 atomic number is found to be Nickle.
Dominant
Explanation:
Meaning that particular gene is stronger than the others.
Answer:
Moles added = 0.0722 moles
Mass added = 2.3104 g
Explanation:
Given:
Pressure = 640.0 torr
The conversion of P(torr) to P(atm) is shown below:
So,
Pressure = 640 / 760 atm = 0.8421 atm
Temperature = 25.0 °C
The conversion of T( °C) to T(K) is shown below:
T(K) = T( °C) + 273.15
So,
T₁ = (25.0 + 273.15) K = 298.15 K
Volume = 42.9 L
Using ideal gas equation as:
PV=nRT
where,
P is the pressure
V is the volume
n is the number of moles
T is the temperature
R is Gas constant having value = 0.0821 L.atm/K.mol
Applying the equation as:
0.8421 atm × 42.9 L = n × 0.0821 L.atm/K.mol × 298.15 K
⇒n = 1.4759 moles
Some new moles have been added and the volume has increased to 45.0 L
Using Avogadro's law
Given ,
V₁ = 42.9 L
V₂ = 45.0 L
n₁ = 1.4759 moles
n₂ = ?
Using above equation as:
n₂ = 1.5481 moles
Moles added = n₂ - n₁ = 1.5481 moles - 1.4759 moles = 0.0722 moles
Molar mass of oxygen gas = 32 g/mol
So, Mass = Moles*Molar mass = 0.0722 * 32 g = 2.3104 g
<u>Moles added = 0.0722 moles</u>
<u>Mass added = 2.3104 g</u>
