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Reptile [31]
3 years ago
13

What is the total number of electron pairs shared between the two atoms in an O2 molecule?

Chemistry
1 answer:
vodka [1.7K]3 years ago
8 0
The answer is (2) 2 pairs. The oxygen atoms combine to get stable structure. So after the combination, each atom needs to have 8 electrons. So when they share 4 electrons can satisfy this requirement. Then there are 2 pairs shared.
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En 50 gr de de agua se disuelven 10 gr de NaCl con una densidad de 1,08 m/cm3. Hallar la M y la m a. 3,06 M y 3,06m b. 3,06 M y
Lubov Fominskaja [6]

Answer:

Opcion b. 3.06M y 3.4 m

Explanation:

Nuestra solución se compone de:

Soluto → NaCl (10 g)

Solvente → agua (50 g)

Primero, convertimos la masa de soluto a moles:

10 g . 1mol / 58.45g = 0.171 moles

Convertimos la masa de solvente, de g a kg → 50 g . 1kg/1000 g = 0.05 kg

m → molalidad (tipo de concentración que relaciona los moles de soluto en 1kg de solvente)

m = mol/kg → 0.171 mol/0.05kg = 3.42 m

Para calcular M, necesitamos el volumen de solución, y para eso aplicamos densidad. Antes, sumamos masa de soluto + masa de solvente, para obtener la masa de solución

50 g + 10 g = 60 g de solución

d = m /v → v = m /d → 60g / 1.08g/cm³ = 55.5 cm³

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M = 171 mmol /55.5 mL → 3.08 M

7 0
3 years ago
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