The complete question is;
Calculate the empirical formula for each of the following naturalflavors based on their elemental mass percent composition.
Q1)
methyl butyrate (component of apple taste andsmell): C -58.80 % H- 9.87 %
O -31.33.%Express your answer as a chemical formula.
Q2)
vanillin (responsible for the taste and smellof vanilla): C - 63.15% H- 5.30 %
O - 31.55%Express your answer as a chemical formula.
Q1)
empirical formula is the simplest ratio of whole number of elements in the compound. as the percentages have been given, lets calculate for 100 g of compound
C H O
mass 58.80 g 9.87 g 31.33
molar mass 12 g/mol 1 g/mol 16 g/mol
number of moles 58.80/12 9.87/1 31.33/16
= 4.9 =9.87 = 1.95
then divide number of moles by least number of moles - 1.95 in this case
4.9/1.95 = 2.51 9.87/1.95 = 5.06 1.95/1.95= 1
next multiply by 2 to get numbers that can be rounded off to whole numbers
2.51x2 = 5.02 5.06x2 = 10.12 1x2 = 2
when rounded off to the nearest whole number
C - 5
H - 10
O - 2
therefore empirical formula is C₅H₁₀O₂
Q2) for this too since elemental composition has been given in percentages lets calculate for 100 g of compound
C H O
mass 63.15 g 5.30 g 31.55 g
molar mass 12 g/mol 1 g/mol 16 g/mol
number of moles 63.15/12 5.30/1 31.55/16
=5.26 =5.30 =1.97
divide the number of moles by the least number of moles - 1.97
5.26/1.97 5.30/1.97 1.97/1.97
=2.67 = 2.69 = 1
multiply each by 3 to get numbers that can be rounded off to whole numbers
2.67x3 = 8.01 2.69x3 = 8.07 1x3 = 3
rounded off to the nearest whole numbers
C - 8
H - 8
O - 3
empirical formula = C₈H₈O₃
Answer:
9414.0 J.
Explanation:
- The amount of heat absorbed by water through burning a 1.5 g jellybean can be calculated from the relation:
<em>Q = m.c.ΔT.</em>
where, Q is the amount of heat absorbed by water,
m is the mass of water (m = 150.0 g),
c is the specific heat of water (c = 4.184 J/g °C),
ΔT is the temperature difference (final T - initial T) (ΔT = 15.0 °C).
<em>∴ Q = m.c.ΔT</em> = (150.0 g)(4.184 J/g °C)(15.0 °C) = <em>9414.0 J.
</em>
- <em>So, the jellybean have 9414.0 J that is releases to water.</em>
PH becomes lower when the H+ ion concentration increases.
<span>pH becomes higher when the H+ ion concentration decreases. </span>
<span>pH becomes lower when the OH- ion concentration decreases. </span>
pH becomes higher when the OH- ion concentration increases.
Hope this helps!
Answer:
Explanation:
So lead has a density of 11.34 g/cm^3 according to a quick google search. If this is not the value you are using, just replace what you do use where I put 11.34
knowing the density, if we knew the volume we could find the mass by unit conversion since g/cm^3 * cm^3 = g, so we would multiply the density by the volume. And the question gives us the means to find the volume.
Volume of a cylinder is area of its base times the height. Area of its base, a circle (since it's a cylinder) is π*r^2 where r is the radius and π is roughly 3.14. I will leave π as the symbol until the end so it's easier to deal with.
So volume = area * height = πr^2*h = π4^2*10 = 160π (I moved pi to the back). It's units are cm^3 since both measurements were in cm. You can feel free to multiply π by 160 now if you like. Anyway, now that we have the volume we multiply it by the density. so 160π cm^3 * 11.34 g/cm^3 = 1814.4π g. If you multiply that by 3.14 for π you get 5697.216 g. And there's the mass. Let em know if there was something you didn't understand.
Answer:
54 g
Explanation:
To solve this problem we will simply follow the Law of conservation of mass.
According to this law:
" The mass of product in the chemical reaction must be equal to the mass of reactant"
Given data:
mass of methane= 24 g
mass of oxygen= 96 g
mass of carbon dioxide= 66 g
mass of water= ?
Solution:
CH4 + 2O2 → CO2 +2H2O
24g + 96 g = 66 g + ?
120 g = 66 g + ?
120 g - 66 g = 54 g
so 54 g of waters are produce.
We can see that mass of water is equal to the sum of masses of reactant minus mass of product formed i.e mass of carbon dioxide.
