Answer:
a) Volume of vial= 9.626cm3
b) Mass of vial with water = 62.92 g
Explanation:
a) Mass of empty vial = 55.32 g
Mass of Vial + Hg = 185.56 g
Therefore,
Density of Hg = 13.53 g/cm3
b) Volume of water = volume of vial = 9.626 cm3
Density of water = 0.997 g/cm3
Non metals form ionic bonds by gaining and losing electrons to complete their valence she'll and increase stability.
Metals form covalent bonds by sharing electrons.
Water is a compound that is made up of oxygen and hydrogen atoms, therefore the smallest particle of water is water molecule. The smallest particle representing water is written as H2O. H2O is the smallest unit to which water can be split while still retaining the properties of water.
Proteins are made of carbon, hydrogen,oxygen, and nitrogen (CHON). Nucleic acids such as DNA and RNA contain carbon,hydrogen, oxygen, nitrogen, and phosphorus(CHON P). The body also needs trace amounts of other elements such as calcium,potassium, and sulfur for proper functioning of muscles, nerves, etc.
Answer:
-7612.5 kJ.
Explanation:
Equation of the reaction:
C18H36O2 + 26O2(g) --> 18H2O(g) + 18CO2(g)
ΔHrxn = ΔHp - ΔHr
ΔH (combustion) = [18*(ΔHf of CO2) + 18*(ΔHf of H2O)] - [1*(ΔHf of C18H36O2) + 26*(ΔHf of O2)]
= [18 * (-394) + 18 * (-242)] - [1 * (-948) + 26 * (0)]
= [(-7092) + (-4356)] - (-948)]
= -10500 kJ/mol
Molar mass:
C18H36O2;
= (18*12) + (36*1) + (2*16)
= 284 g/mol
O2:
= (2 * 16)
= 32 g/mol
Number of moles = mass/molar mass
C18H36O2:
= 206/284
= 0.725 mol.
O2:
= 943.2/32
= 29.475 mol
Finding the limiting reagent,
By stoichiometry, 1 mole of steric acid combusted in 26 moles of oxygen.
Therefore,
= 29.475 mol of O2 * 1 mol of steric acid/26 mol of O2
= 1.134 mol of steric acid(only 0.725 mol is present)
Steric acid is the limiting reagent.
q = n * ΔHrxn
= 0.725 * -10500
= -7612.5 kJ.
