Answer:
The lungs' main role is to bring in air from the atmosphere and pass oxygen into the bloodstream. From there, it circulates to the rest of the body. Help is required from structures outside of the lungs in order to breath
Explanation:
Answer:
Molar mass = 27.88 g/mol
Explanation:
The relationship between how gases effuses is given by Graham's law of effusion. This law is given as;
Rg / Rxe = (Mxe / Mg)
Where;
Rg = Rate of effusion of gas g
RXe = Rate of effusion of Xe
Mxe = Molar mass of Xe = 131.29 g/mol
Mg = Molar mass of gas g
From the question;
Rg : Rxe = 2.17 : 1
Rg / Rxe = 2.17 / 1 = 2.17
2.17 = 131.29 / Mg
Squaring both sides
4.7089 = 131.29 / Mg
Mg = 131.29 / 4.7089
Mg = 27.88 g/mol
Answer: C. 146 g
Explanation:
To calculate the moles, we use the equation:
Thus
For sodium nitrate
moles = 1.72
Molar mass of sodium nitrate = 85g/mol
Putting values in above equation, we get:
A pure chemical substance
Explanation:
A pure substance is any substance made up of only one kind of matter and has definite properties.
Matter is anything that has weight and occupies space
On a broad basis, matter can be categorized as pure or distinct substances and impure substances or mixtures.
Pure substances have the following properties;
- All parts of a pure substance remains the same throughout i.e homogeneous.
- Their composition is definite
- They cannot easily be broken or separated down into simpler substances by physical means.
They have a unique set of chemical properties.
Pure substances are elements and compounds.
learn more:
Heterogeneous mixtures brainly.com/question/1446244
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