Answer:
v = 86.2 mL
Explanation:
Given data:
Mass of ethanol = 68.0 g
Volume of ethanol = ?
Density = 0.789 g/mL
Solution:
Density:
Density is equal to the mass of substance divided by its volume.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
D= density
m=mass
V=volume
Now we will put the values in formula.
0.789 g/mL = 68.0 g/ v
v = 86.2 mL
Answer:
2.475 mol of O2 formed.
Explanation:
Given 1.65 moles of KClO3 as the target amount in the reactant, used the coefficient of the balanced chemical reaction involved to determine the number of moles of O2 molecules formed.
x mole of O2 = 1.65 mol KClO3 x [(3 mol O2)/ (2 mol KClO3)] = 2.475 mol of O2
x mole of O2 formed = 2.475 mol of O2
To be able to answer this question, we just have to determine the heat of fusion of the water. From reliable sources, the heat of fusion of water is equal to 80 cal/g. Multiplying this value to the mass given,
Heat = (225 g)(80 cal/g)
= 18000 cal
Therefore, the amount of heat that must be removed is equal to 18000 cal or 18 kcal.
The ingredients in most commercial baby oil products are 98% mineral oil and 2% fragrance.
Answer:
the answer is C) the iron will repel the substance because it has more electrons than protons