Can someone help me ASAP THIS IS IS A IMPORTANT GRADE

Chemistry

2 answers:

liubo4ka [24]2 years ago

7 0

Answer:

Explanation:

There are three kinds of blood vessels: arteries, veins, and capillaries.

vaieri [72.5K]2 years ago

5 0

ITS AAAAAAAAAAAAAAAAA

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A 0.271g sample of an unknown vapor occupies 294ml at 140C and 874mmHg. The emperical formula of the compound is CH2. How many m

Phoenix [80]

Using PV = nRT, we can calculate the moles of the sample.
874 mmHg = 116,524 Pa
n = PV/RT
n = 116,524 x 294 x 10⁻⁶ / 8.314 x (140 + 273)
n = 9.98 x 10⁻³ mol

moles = mass / Mr
Mr = 0.271/9.98 x 10⁻³
Mr = 27.2
Mass of empirical formula = 14
Repeat units = 27.2 / 14 ≈ 2

Formula of substance:
C₂H₄

Combustion equation:
C₂H₄ + 3O₂ → 2CO₂ + 2H₂O

1 mole produces 2 moles of CO₂, so 3 moles will produce 6 moles CO₂

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2 years ago

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