Answer:
C. Carbon dioxide
Explanation:
Carbon dioxide is one of the end-product of combustion reactions involving many fuels today.
With the rapid increase in urbanization and technological development, man demand for energy increased tremendously. The discovery of fossil fuels paved the way for the astronomical increase in the concentration of carbon dioxide in the atmosphere. The burning of fossil fuels like coal and oil invovles the process where the carbon atoms present in these fuels combine with oxygen in the air to make CO2. This has resulted in an increase in the concentration of atmospheric carbon dioxide (CO2).
The burning fossil fuels for electricity, industry, heat, and transportation are the major sources of the emossion of carbon dioxide.
Also, the cutting down of trees for paper production, building construction and for the establishment of settlements also increase the concentration of carbon dioxide in the atmosphere. Trees are help remove carbon dioxide from the atmosphere through the process of photosynthesis. However, when these trees are cut down, carbon dioxide accumulates in the atmosphere.
Answer:
Structureless rocks like granite and other intrusive rocks tend to weather into characteristic rounded shapes through this process.
Explanation:
Answer:
Explanation:
To calculate the moles, we use the equation:
According to stoichiometry :
2 moles of releases = 6542 kJ of heat
0.9858 moles of release = of heat
Thus heat given off by burning 7.700 g of will be absorbed by water.
Q = Heat absorbed= 3224kJ = 3224000J (1kJ=1000J)
m= mass of water = 5691 g
c = specific heat capacity =
Initial temperature of the water = = 21.0°C
Final temperature of the water = = ?
Putting in the values, we get:
The final temperature of the water is
Hello!
The reaction that took place was
B) exothermic. The equation for the ΔH is
To know if this reaction is
exothermic or
endothermic we will need to look at the
sign of the
ΔH. If it is
positive, it means that enthalpy of the products is
higher than the enthalpy of the reagents and the reaction is
endothermic.
If the sign is negative, it means that the enthalpy of the products is
lower than the enthalpy of the reagents and the reaction is
exothermic. In this case, the sign is negative, so the reaction is exothermic.
Have a nice day!
Answer:
1. 0.74mol
2. 0.42mol
3. 2.125mol
4. 0.301mol
5. 4.52 × 10^23 particles
Explanation:
Number of moles (n) in a substance can be found using the formula:
mole (n) = mass/molar mass
Using this formula, the following moles are calculated:
1. Molar of Na = 23g/mol
mole = 17/23
mole = 0.74mol
2. Molar mass of Na2SO4 = 23(2) + 32 + 16(4)
= 46 + 32 + 64
= 142g/mol
Mole = 60/142
mole = 0.42mol
3. Molar mass of CO2 = 12 + 16(2)
= 12 + 32
= 44g/mol
mole = 93.5/44
mole = 2.125mol
4. Molar mass of sodium nitrate (NaNO3) = 23 + 14 + 16(3)
= 23 + 14 + 48
= 85g/mol
mole = 25.6/85
mole = 0.301mol
5. Number of particles in one mole of a substance is 6.022 × 10^23 particles. Hence, in 0.75mol of calcium hydroxide (Ca(OH)2, there will be;
0.75mol × 6.02 × 10^23
= 4.515 × 10^23
= 4.52 × 10^23 particles