We calculate it as follows:
Moles CO2 = 0.01849 g / 44 = 0.000420
<span>Mass C = 0.000420 x 12 = 0.00504 g </span>
<span>Moles H = 2 x 0.006232 / 18 = 0.000692 </span>
<span>Mass H = 0.000692 g </span>
<span>Mass O = 0.005982 - ( 0.00504 + 0.000692) = 0.00025 </span>
<span>Moles O = 0.00025 / 16 = 0.0000156 </span>
<span>C 0.000420
H 0.000692
O 0.0000156
</span>
<span>divide each by the smallest value, giving you the chemical formula as:
</span><span>
C27H44O</span>
Answer:- Van't hoff factor(i) for the unknown ionic compound is 2.77.
Solution:- Elevation in boiling point is a colligative property and the equation used for solving this type of problems is...
delta Tb = i x m x kb
where delt Tb is elevation in boiling point.
i is Von't hoff factor.
m is molality of the solution and kb is the molal elevation constant. It's value for water is 0.512.
Boiling point of solution is given as 103.4 degree C and we know that water boils at 100 degree C.
So, delta Tb = 103.4 - 100 = 3.4 degree C
molality is given as 2.4m.
Let's plug in the values...
3.4 = i x 2.4 x 0.512
i = 3.4/(2.4 x 0.512)
i = 2.77
Answer:
HgS
Explanation:
In a 0.350g-sample there are 0.302 g of Hg. Then, there is 0.350 g - 0.302 g = 0.048 g of S. To calculate the empirical formula, we have to follow a series of steps.
Step 1: Calculate the percent composition
Hg: (0.302 g / 0.350 g) × 100% = 86.3%
S: (0.048 g / 0.350 g) × 100% = 13.7%
Step 2: Divide each percentage by the atomic mass of the element
Hg: 86.3 / 200.59 = 0.430
S: 13.7 / 32.07 = 0.427
Step 3: Divide the numbers by the smallest one
Hg: 0.430/0.427 ≈ 1
S: 0.427/0.427 = 1
The empirical formula is HgS.
Your answer is A. When I balance equations, I take inventory of what I have on each side and how many I have. So in the first equation you have 2 Na on both sides. You have 1 Cl on both sides. You have 2 Hydrogens on both sides. You have 1 SO4 on both sides. Therefore, both sides of the equation are equal AKA balanced.
Also, when balancing equations, it's easier to leave your sulfates, sulfites, phosphates, phosphites, etc. in their formula because it's easier to balance.
I hope I was able to help. Best of luck!
Answer:
-6300J
Explanation:
The quantity of heat required to raise the temperature of a substance per unit of mass could be written as:
Q = -m×C×ΔT
<em>Where Q is heat, m is mass of substance, C is specific capacity and ΔT is change in temperature</em>.
Replacing:
Q = -175g × 2.4J/gK × (38.6°C-23.7°C)
Q = -6258J ≡ <em>-6300J</em>
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