Based on the balanced chemical reaction presented above, every mole of magnesium (Mg) yields one mole of diatomic hydrogen (H2). When converted to masses, every 24.3 grams of magnesium yields 2 grams of hydrogen.
From the given, there are 20 grams of magnesium available for the reaction. With this amount, the expected yield of hydrogen is 1.646 grams. To calculate the percent yield, divide the actual yield to the hypothetical yield.
*The case is impossible because the actual yield is greater than the theoretical yield.
If we assume that there had been a typographical error and that the actual yield is 0.7 grams instead of 1.7 grams, the percent yield becomes 42.5%. Thus, the answer is letter E.
Explanation:
It is given that two loads have 0.75 Ampere current each. And, they contain 2500 milli ampere per hour Ni-Cd battery.
As both the loads are connected in parallel. Hence, total current will be calculated as follows.
I = ![I_{1} + I_{2}](https://tex.z-dn.net/?f=I_%7B1%7D%20%2B%20I_%7B2%7D)
= 0.75 A + 0.75 A
= 1.5 A
= ![1.5 A \times \frac{1000 mA}{1 A}](https://tex.z-dn.net/?f=1.5%20A%20%5Ctimes%20%5Cfrac%7B1000%20mA%7D%7B1%20A%7D)
= 1500 mA
Relation between time and capacity of battery is as follows.
Capacity = Current × time (in hour)
therefore, time = ![\frac{Capacity}{Current}](https://tex.z-dn.net/?f=%5Cfrac%7BCapacity%7D%7BCurrent%7D)
= ![\frac{2500 mA. h}{1500 A}](https://tex.z-dn.net/?f=%5Cfrac%7B2500%20mA.%20h%7D%7B1500%20A%7D)
= 1.667 hr
Thus, we can conclude that the battery provide power to the load up to 1.667 hours.
Answer: True
The formula of weight is w = mg, where m is the mass and g is the acceleration of gravity. If you want to calculate an object's weight, you need to know the two components: mass and gravity.
You only need to know the mass of the object because the acceleration of gravity is ALWAYS (assuming the object is on Earth) 9.8 m/s^2.
In the group 3 to group 12 of elements, it is the d subshell
that filled up going across the rows,.
In the d-block of the periodic table, we have the Zinc, Cadmium, and
Mercury. This corresponds to the teams 3
to 12 of the periodic table.
Answer: 600°C
Explanation:
This reaction is explained by Charles' law as the pressure is constant.
From the question, we obtained:
V1 = 67mL
T1 = 18°C = 18 +273 = 291K
V2 = 3V1 ( Vol is tripled) = 3x67 = 201mL
T2 =?
Applying the Charles' law,
V1 /T1 = V2 /T2
67/291 = 201 / T2
Cross multiply to express in linear form.
67xT2 = 291x201
Divide both side by 67, we have:
T2 = (291x201) /67
T2 = 873K
Converting to Celsius temperature, we have
T°C = K — 273
T°C = 873 — 273 = 600°C