Answer:
1) HCl reagent was added in excess
Explanation:
The equation of the reaction is given as;
Zn + HCl --> ZnCl2 + H2
From the stoichiometry;
1 mol of Zn reacts with 1 mol of HCl
In 2g of Zn;
mass = 2
Molar mass = 65.38g/mol
Number of moles = Mass/ Molar mass = 2 / 65.38 = 0.03059 mol
In 10ml of HCl;
the number of moles is: moles = Concentration * Volume = (10 moles/L) (0.0100 L) = 0.10 moles
Comparing 0.03059 mol of Zn : 0.10 mol of HC with the stochiometry, we can deduce that HCl is by far greater. Hence the correct option is option 1.
1.079 x 10⁹ km/h
<h3>
Further explanation</h3>
2.998 x 10⁸ m/s has been known as the speed of light.
Let us convert the unit m/s to km/hour.
Change in unit length:
If 1 km = 1,000 cm, then ![\boxed{ \ 1 \ cm = 0.001 \ km \ } \rightarrow \boxed{ \ 1 \ cm = 10^{-3} \ km \ }](https://tex.z-dn.net/?f=%5Cboxed%7B%20%5C%201%20%5C%20cm%20%3D%200.001%20%5C%20km%20%5C%20%7D%20%5Crightarrow%20%5Cboxed%7B%20%5C%201%20%5C%20cm%20%3D%2010%5E%7B-3%7D%20%5C%20km%20%5C%20%7D)
Change in unit time:
If
, then ![\boxed{ \ 1 \ second = \frac{1}{3,600} \ hours \ }](https://tex.z-dn.net/?f=%5Cboxed%7B%20%5C%201%20%5C%20second%20%3D%20%5Cfrac%7B1%7D%7B3%2C600%7D%20%5C%20hours%20%5C%20%7D%20)
The Process:
![\boxed{ \ 2.998 \times 10^8 \ \frac{m}{s} \times \frac{10^{-3} \ km}{1 \ m} \times \frac{1 \ s}{\frac{1}{3,600} \ hours} \ }](https://tex.z-dn.net/?f=%5Cboxed%7B%20%5C%202.998%20%5Ctimes%2010%5E8%20%5C%20%5Cfrac%7Bm%7D%7Bs%7D%20%5Ctimes%20%5Cfrac%7B10%5E%7B-3%7D%20%5C%20km%7D%7B1%20%5C%20m%7D%20%5Ctimes%20%5Cfrac%7B1%20%5C%20s%7D%7B%5Cfrac%7B1%7D%7B3%2C600%7D%20%5C%20hours%7D%20%5C%20%7D)
![\boxed{ \ 2.998 \times 10^8 \times 10^{-3} \ km \times \frac{3,600}{hours} \ }](https://tex.z-dn.net/?f=%5Cboxed%7B%20%5C%202.998%20%5Ctimes%2010%5E8%20%5Ctimes%2010%5E%7B-3%7D%20%5C%20km%20%5Ctimes%20%5Cfrac%7B3%2C600%7D%7Bhours%7D%20%5C%20%7D)
![\boxed{ \ 10,792.8 \10 \times 10^5 \ \frac{km}{hour} \ }](https://tex.z-dn.net/?f=%5Cboxed%7B%20%5C%2010%2C792.8%20%5C10%20%5Ctimes%2010%5E5%20%5C%20%5Cfrac%7Bkm%7D%7Bhour%7D%20%5C%20%7D)
Remember, we must write the results in scientific notation, i.e.,
![\boxed{\ a \times 10^b \ } \rightarrow \boxed{ \ 1 \leq a < 10 \ } \rightarrow \boxed{ \ b \ must \ be \ an \ integer \ }](https://tex.z-dn.net/?f=%5Cboxed%7B%5C%20a%20%5Ctimes%2010%5Eb%20%5C%20%7D%20%5Crightarrow%20%5Cboxed%7B%20%5C%201%20%5Cleq%20a%20%3C%2010%20%5C%20%7D%20%5Crightarrow%20%5Cboxed%7B%20%5C%20b%20%5C%20must%20%5C%20be%20%5C%20an%20%5C%20integer%20%5C%20%7D)
Thus the result of unit conversion is
![\boxed{ \ \boxed{ \ 2.998 \times 10^8 \ m/s \ } \rightarrow \boxed{ \ 1.079 \times 10^9 \ km/h} \ }](https://tex.z-dn.net/?f=%5Cboxed%7B%20%5C%20%5Cboxed%7B%20%5C%202.998%20%5Ctimes%2010%5E8%20%5C%20m%2Fs%20%5C%20%7D%20%5Crightarrow%20%5Cboxed%7B%20%5C%201.079%20%5Ctimes%2010%5E9%20%5C%20km%2Fh%7D%20%5C%20%7D)
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Keywords: speed of light, convert, m/s to km/h, unit length, time, hours, minutes, second, scientific notation
Answer:
dude me too in which garde are you ☠
the molarity of a solution made by dissolving 5.67 g of potassium chloride in enough water to make 100.0 mL of solution.
Answer:
Anions name is given to a non-metal when it forms an ion, and it has negative charge.