Answer:
3.1 kg
Explanation:
Step 1: Write the balanced combustion equation
C₈H₁₈ + 12.5 O₂ ⇒ 8 CO₂ + 9 H₂O
Step 2: Calculate the moles corresponding to 1.0 kg of C₈H₁₈.
The molar mass of C₈H₁₈ is 114.23 g/mol.
1.0 × 10³ g × 1 mol/114.23 g = 8.8 mol
Step 3: Calculate the moles of CO₂ produced from 8.8 moles of C₈H₁₈
The molar ratio of C₈H₁₈ to CO₂ is 1:8. The moles of CO₂ produced are 8/1 × 8.8 mol = 70 mol.
Step 4: Calculate the mass corresponding to 70 moles of CO₂
The molar mass of CO₂ is 44.01 g/mol.
70 mol × 44.01 g/mol = 3.1 × 10³ g = 3.1 kg
Answer:
57.05
Explanation: the formula is...
length x width x height
The method of separation used was paper chromatography and the pigments were separated based on rates moved by each pigment. The extract was also separated based on the solubility of the various components and was found to contain green chlorophyll and yellow carotenoids.
All types of chromatography employ two different immiscible phases in contact with each other namely the mobile phase and the stationary phase.
Since the question mentions a change in pressure from 1 atm to 6.73 atm, which triggers a change in volume, then it's premise is Boyle's Law, which notes that pressure is inversely proportional to volume (as volume decreases, pressure increases, and vice versa). As such, Boyle's Equation can be used to determine the initial pressure of the air. Also keen to note is that the Pressure at STP is 1 atm.
Boyle's Equation: P₁V₁ = P₂V₂
Since the initial pressure (P₁) is 1 atm, the final pressure (P₂) is 6.73 atm and the final volume is 995 mL, then we can substitute these into the equation to find the initial volume (V₁).
P₁V₁ = P₂V₂
∴ by substituting the known values,
⇒ (1 atm) (V₁ ) = (6.73 atm)(995 mL)
⇒ V₁ = (6,696.35 atm mL) ÷ ( 1 atm)
⇒ V₁ = 6,696.35 mL
<span>Thus, the original volume of this gas in mL is </span>≈ 6,696.35 mL
Answer:
19 protons, 20 neutrons and 18 electrons.
Explanation:
The atomic number gives the number of protons 19
p
=
19
The atomic mass is the sum of the protons and neutrons
p
+
n
=
39
p
=
19
put p into the equation and solve for n the neutrons.
19
+
n
=
39
Subtract 19 from both sides
19
−
19
+
n
=
39
−
19
n
=
20
The number of electrons equals the number of protons in a neutral atom. The positive charge equals the negative charge. The negative charge is the number of electrons. This ion has a charge of +1. So solve for the negative charge.
−
19
+
1
=
−
18
The negative charge is -18 so
e
=
18