Answer:
Explanation:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
The substances with higher value of specific heat capacity require more heat to raise the temperature by one degree as compared the substances having low value of specific heat capacity.For example,
The specific heat capacity of oil is 1.57 j/g. K and for water is 4.18 j/g.K. So, water take a time to increase its temperature by one degree by absorbing more heat while oil will heat up faster by absorbing less amount of heat.
Consider that both oil and water have same mass of 5g and change in temperature is 15 K. Thus amount of heat thy absorbed to raise the temperature is,
For oil:
Q = m.c. ΔT
Q = 5 g× 1.67 j/g K × 15 K
Q = 125.25 j
For water:
Q = m.c. ΔT
Q = 5 g× 4.18 j/g K × 15 K
Q = 313.5 j
we can observe that water require more heat which is 313.5 j to increase its temperature.
Answer:
Six
Explanation:
Oxygen has six valence electrons in its elemental form so its formal charge is 6 – 6 = 0. Each hydrogen atom owns one electron [(2x½) = 1].
The compound Fe2O3 contains C) 5 total atoms.
This is because there are 2 atoms of Fe (iron) and 3 atoms of O (oxygen) bonded together in this compound, as denoted by the subscripts, and 2+3 = 5.
Hope this helps!
Explanation:
A.
Yes
B.
2KHP + Mg(OH)2 = 2KOH + Mg(HP)2
KHP is an acidic salt which reacts with Mg(OH)2 which is a base via double displacement/decomposition reaction.
C.
• One approach is to prepare the solution volumetrically using KHP crystals.
• Preparing 1 liter of 0.1 M KHP you would add 0.1 moles of KHP
Molar mass of KHP(C8H5KO4)
= (12*8) + (5*1) + 39 + (16*4)
= 204 g/mol
Number of moles = mass/molar mass
= 20.4/204
= 0.1 mol.
• This is added to a 1 liter volumetric flask, add deionized water until near the fill line, stopper and mix
D.
Number of moles = molar concentration * volume
= 0.025 * 0.100
= 0.0025 mol
Equation for the reaction:
Ba(OH)2 + 2KHP --> Ba(KP)2 + 2H2O
1 mole of Ba(OH)2 reacted with 2 moles of KHP. By stoichiometry,
Number of moles of Ba(OH)2 = 0.0025/2
= 0.00125 mol.
Molarity = number of moles/volume
= 0.00125/0.01
= 0.125 M of Ba(OH)2.
