Answer:
Tinitial = 78.6°C
Explanation:
In a calorimetry experiment, the flow heat is measured for a system that has a state change. In this case, there isn't happening a physical change, so the heat is called sensitive heat, and it's calculated by:
q = mxCpxΔT
Where q is the heat, m is the mass, Cp is the specific heat and ΔT is the difference of final and initial temperature (Tfinal - Tinitial).
Copper is losing heat, so q is negative, then:
-1860 = 92x0.377x(25 - Ti)
34.684(25 - Ti) = -1860
25 - Ti = -53.63
-Ti = -78.63
Ti = 78.6ºC
Answer:
joe mama
Explanation:
400 + 20 + 420
Answer:
Mass = 42.6 g
Explanation:
Given data:
Mass of CF₂Cl₂ = 31.2 g
Mass of Cl₂ = ?
Solution:
Number of moles of CF₂Cl₂ = mass/molar mass
Number of moles = 31.2 g/121 gmol
Number of moles = 0.3 mol
1 mole of CF₂Cl₂ contain 2 moles of Cl atom.
0.3 mol × 2 = 0.6 mol
Mass of Cl₂:
Mass = number of moles × molar mass
Mass = 0.6 mol × 71 g/mol
Mass = 42.6 g
Answer:
Non polar covlant
Explanation:
Answer:
See Explanation
Explanation:
Pb2O3 is better formulated as PbO.PbO2. It is actually a mixture of the two oxides of lead, lead II oxide and lead IV oxide.
This implies that this compound Pb2O3 (sometimes called lead sesquioxide) is a mixture of the oxides of lead in its two known oxidation states +II and +IV.
Hence Pb2O3 contains PbO and PbO2 units.
Answer:
The gases will expand 8.2 L against the constant pressure of 710 torr.
Explanation:
Given that:
the original volume V₁ = 35 cm³ = 35 × 10⁻⁶ m³
Since the combustion of the mixture releases energy then :
the work W = - 775 J
Pressure = 710 torr
Since 1 torr = 133.322 Pa
710 torr = 94658.62 Pa
We all know that:
W = -PdV
-775 = - 94658.62 Pa ( V₂ - V₁ )
-775 = - 94658.62 ( V₂ - 35 × 10⁻⁶)
-775/ - 94658.62 = V₂ - 35 × 10⁻⁶
0.008187 = V₂ - 35 × 10⁻⁶
V₂ = 0.008187 + 35 × 10⁻⁶
V₂ = 0.008222 m³
The change in volume dV = V₂ - V₁
The change in volume dV = 0.008222 m³ - 35 × 10⁻⁶ m³
The change in volume dV = 0.008187 m³
To litres
The change in volume dV = 8.2 L
Thus, the gases will expand 8.2 L against the constant pressure of 710 torr.
Answer:
6.321 × 10^22
Explanation:
Mass of Oxygen =
3.36
g
Molar mass of oxygen (
O
2
) = 16 x 2 =
32
g
m
o
l
−
Total molecules in oxygen = Mass in grams/Molar mass x
N
A
=
3.36
32
x
6.02
x
10
23
=
6.321
x
10
22
Note:
N
A
(Avagadro's number) =
6.02
x
10
23
Hope it helps...