Answer:
0.991 grams of N₂ are present in the flask
Explanation:
Let's apply the Ideal gases Law to solve this:
P . V = n . R .T
Previously we have to convert Torr to atm (because the units of R, Universal Gases Constant). Let's think the rule of three:
760 Torr is 1 atm
19 Torr is (19 . 1)/ 760 = 0.025 atm
0.025 atm . 26L = n . 0.082 L.atm/mol.K . 224K
(0.025 atm . 26L) / (0.082 L.atm/mol.K . 224K) = 0.035 moles
Molar mass N₂ = 28 g/m
Mol . molar mass = mass → 0.035 m . 28 g/m = 0.991 grams
Answer: 18L
Explanation:
Solving this question would be easier by assigning variables.
so, let x = amount of 67% needed solution
Let y = amount of 42% needed solution.
From the question, we know that
x + y = 42 thus,
y = 42 - x
we also know that the pure herbicide in the 67% solution plus the herbicide I'm the 46% solution must be equal to the amount of pure herbicide in the final solution. Thus mathematically, we have
0.67x + 0.46y = 0.55*42
0.67x + 0.46y = 23.1
Remember, y = 42 - x, substituting this value, we have
0.67x + 0.46(42-x) = 23.1
0.67x + 19.32 - 0.46x = 23.1
0.21x = 23.1 - 19.32
0.21x = 3.78
x = 18
.therefore the amount of 67% solution needed is 18L
Answer:
Water vapor enters the atmosphere through evaporation from water bodies (oceans, seas, lakes, rivers), ice/snow cover and soil, as well as through evapotranspiration from vegetation
Explanation:
The cycle, which occurs in the troposphere, begins as the sun evaporates large amounts of water from the earth's surface and the moisture is transported to other regions by the wind. As air rises, expands, and cools, water vapor condenses and clouds develop
When water is changed from a liquid to a vapor the chemical composition of the water does not change. When a water changes from a liquid to a vapor it still has the chemical composition H2O, thus making the change physical.
Answer:
there are 2970000cm in 29.7km
Explanation:
