Answer:
The specific heat capacity is 0.67
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
The amount of heat that a body receives or transmits is determined by the following expression:
Q = c * m * ΔT
Where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
This expression indicates that between heat and temperature there is a direct proportional relationship.
In this case:
- Q= 100 J
- c= ?
- m= 5 g
- ΔT= Tfinal - Tinitial= 40 °C - 10 °C= 30 °C
Replacing:
100 J= c*5 g* 30°C
Solving:
c= 0.67
<u><em>The specific heat capacity is 0.67 </em></u><u><em></em></u>
Answer:
The mass of nitrogen gas will be 31,3 g
Explanation:
We calculate the weight of 1 mol of N2 (nytrogen gas):
Weight 1 mol N2= 2 (weight N)= 2 x 14 g/mol = 28g/mol
The conditions STP are 1 atm of pressure and 273K of temperature. We use the formula:
PV=nRT
1 atmx 25,0L= n x0,082 l atm/K mol x 272 K
n= 1 atmx 25,0L/0,082 l atm/K mol x 272 K= 1, 12 mol
1 mol N2-----28 g
1,12mol N2---x= (1,12mol N2 x28g)/1 mol N2= 31, 3 g
The enthalpy change accompanying the reaction of 0.95 g of S is -11.85 kJ
<h3>Further explanation</h3>
Given
ΔH° for the reaction is -790 kJ
Required
The enthalpy change
Solution
Reaction
2S (s) + 3O₂(g) = 2SO₃ (g)
mol of S(MW=32 g/mol) :
For 2 mol S, the entalphy = -790kJ
The enthalpy change for 0.03 mol :
The human eye can detect light at wavelengths between 400 to 900 nanometers. That is why we call this part of the electromagnetic spectrum visible light.
Answer:
0.00121 atm
Explanation:
Step 1: Given data
- Height of the column of water (h): 12.5 m
- Density of water (ρ): 1.00g/cm³
- Gravitational constant (g): 9.80665 m/s²
Step 2: Calculate the pressure exerted by the column of water in SI units
The pressure exerted by the column of liquid depends on the height of the column, the density of the liquid and the gravitational constant. We can calculate it using the following expression.
P = ρ × g × h
P = 1.00g/cm³ × 9.80665 m/s² × 12.5 m
P = 123 Pa
Step 3: Convert "P" to atm
We will use the conversion factor 101325 Pa = 1 atm.
123 Pa × (1 atm/101325 Pa) = 0.00121 atm