Answer:
A. The number of atoms of each element is the same on the reactant side as the product side.
Explanation:
The equation demonstrates the law of conservation of mass in such a way that the number of atoms of each element is the same on the reactant side as the product side.
According to the law of conservation of mass "matter is neither created nor destroyed in a chemical reaction but they are changed from one form to another".
- By virtue of this, the number of moles of atoms on both sides of the expression must be the same.
1) Write the chemical reaction to state the molar relations of reactants and products:
2H2(g) + O2 (g) -> 2H2O (g)
2) Molar ratios
2 mol H2 : 1 mol O2 : 2 mol H2O
3) Convert the 46.4 g of H2 and the 414 g of H2O to moles
# moles = grams / molar mass
#moles H2 = 46.4 g / 2 g/mol = 23.2 mol
# moles H2O = 414 g / 18 g/mol = 23 mol
Then the ratio of H2 to H2O = 1.02, which means that there was plenty for the reaction, becasue the theoretical ratio (from the chemical reaction) is 1.0
The number of moles of O2 that reacts to produce 23 mol of H2O is half, becasue the theoretical ratio is 2 mol H2O : 1 mol O2
Then, 11.5 mol of oxygen reacted and that is 11.5 mol * 32.0 g/mol = 368 grams of O2.
Answer: 368 g
When we open a perfume bottle in one corner of your room the smell of perfume reaches other parts because gases have highest rate of diffusion.
Answer:
C.
Explanation:
Specific heat capacity of a substance can be defined as the amount of heat a gram of the substance must lose or absorb in order to change its temperature by a degree Celsius. It is measured in Joules per kilogram per degree Celsius (J/kg°C).
Generally, the specific heat capacity of water is 4.182J/kg°C and is the highest among liquids.
Heat capacity or quantity of heat is given by the formula;
Where;
Q represents the heat capacity or quantity of heat.
m represents the mass of an object.
c represents the specific heat capacity of the substance.
dt represents the change in temperature.
Hence in calculating the relationship between the amount of heat added to a substance and the corresponding temperature change, the specific heat capacity is usually represented by the symbol C.