![brittanysanders](/avatars/48884.jpg)
brittanysanders
05.11.2020 •
Chemistry
Identify the group of ONLY metalloids.
a
aluminum, silicon, phosphorous, sulfur
b
hydrogen, helium, lithium, beryllium
c
boron, germanium, arsenic, silicon
d
boron, carbon, nitrogen, oxygen
Solved
Show answers
More tips
- C Computers and Internet Can You Insert a Regular SIM Card into an iPad? Let s Find Out...
- F Food and Cooking Лечо: вкусное и простое блюдо для любой кухни...
- H Health and Medicine Relieving Swelling in Legs: Causes and Ways to Alleviate the Symptom...
- S Style and Beauty How to Get Rid of a Bruise: Tips and Tricks...
Answers on questions: Chemistry
- C Chemistry How would you separate water from antifreeze...
- C Chemistry What is the probable location of an electron called?...
- M Mathematics If you write down all the numbers from 1 to 500 what will be the 1000th digit that you write? ?...
- M Mathematics Write down all the even numbers from 30 to 300. how many times will the digit 6 appear?...
- M Mathematics Kurt can buy one pound of nails for $3.55 how many pounds of nails can kurt buy for $12 round to the nearest hundredth....
- M Mathematics Yuri wrote twice as many poems as xenia. yuri wrote 3 more poems than xenia. the number of poems written can be represented by the system of equations: y=2x and y=x+3...
- H History In what way did the english bill of rights change the government of england...
- H History What role did the english nobles play in the glorious revolution...
- E English Which statement is an example of the author s use of logos that might be used in an argument?...
- M Mathematics What is the difference between 5 times a number 3 is 12...
Ответ:
The correct answer is 0.67 g H₂
Explanation:
Isopropyl alcohol (C₃H₇OH) can decompose to give acetone (C₂H₆OH) and hydrogen gas (H₂) according to the following chemical equation:
C₃H₇OH (g) ⇒ C₂H₆CO(g) + H₂(g)
We can calculate the initial mass of isopropyl alcohol from the density and volume data:
density = m/V = 0.785 g/mL
⇒ m = density x V = 0.785 g/mL x 25.6 mL = 20.096 g C₃H₇OH
According to the chemical equation 1 mol of C₃H₇OH gives 1 mol H₂. The molar mass of C₃H₇OH is:
molar mass C₃H₇OH = (12 g/mol x 3) + (1 g/mol x 7) + 16 g/mol + 1 g/mol = 60 g/mol
molar mass H₂ = 1 g/mol x 2 = 2 g/mol
So, we obtain: 2 g H₂ from 60 g C₃H₇OH. We multiply this stoichiometric ratio (2 g H₂/60 g C₃H₇OH) by the initial mass of C₃H₇OH to obtain the mass of H₂ is formed:
20.096 g C₃H₇OH x (2 g H₂/60 g C₃H₇OH) = 0.6698 g ≅ 0.67 g H₂