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olchik [2.2K]
3 years ago
9

Which of the following chemical formulas could represent a stable compound formed with an element "X" from group 1A and Oxygen?

Chemistry
1 answer:
vaieri [72.5K]3 years ago
6 0

Answer:

2. X₂O

Explanation:

  • Elements in group 1A are known as alkali metal. Examples include lithium, sodium, and potassium among others.
  • These elements have one valence electron in the outermost energy level and therefore form cations with a charge of +1.
  • They have a valency of 2.
  • Oxygen, on the other hand,has a valency of 2.
  • Therefore, a chemical formula of a compound formed when an element in group 1A say X reacts with oxygen will be X₂O.
  • To write the formula, we identify the symbol of the elements and their valence.
  • Then the atoms of the two elements exchange their valencies which are written as a subscript on each symbol of an element.
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The combustion of 3.795 mg of liquid B, which contains only C, H, and O, with excess oxygen gave 9.708 mg of CO2 and 3.969 mg of
attashe74 [19]

Answer:

Explanation:

9.708 mg of CO₂ will contain 12 x 9.708 / 44 = 2.64 g of C .

3.969 mg of H₂O will contain 2 x 3.969 / 18 = .441 g of H .

mg of O in given liquid B = 3.795 - ( 2.64 + .441 ) = .714 mg

ratio of mg of C , H , O in the compound = 2.64 : .441 : .714

ratio of no of atoms  of C , H , O in the compound

= 2.64 / 12 : .441 /1 : .714 / 16

= .22 : .44 : .0446

= .22 / .22 : .44 / .22 : .044 / .22

= 1 : 2 : .2

1 x 5 : 2 x 5 : .2 x 5

= 5 : 10 : 1

empirical formula of the compound = C₅H₁₀O

Volume of 89.8 mL at 1 .00 atm at 200⁰C

volume of gas at 1 atm and 0⁰C = 89.8 x 273 / 473 mL

= 51.83 mL

51.83 mL weighs .205 g

22400 mL will weigh .205 x 22400 / 51.83 g

= 88.6 g

So molecular weight = 88.6

Let molecular formula be (C₅H₁₀O)ₙ

molecular weight = n ( 5 x 12 + 10 + 16 )

= 86 n

86 n = 88.6

n = 1 approx

So molecular formula is same as empirical formula

C₅H₁₀O is molecular formula .

6 0
2 years ago
This gas law works only if temperature is recorded in ———— units
Vsevolod [243]

Answer:

Kelvin

Explanation:

  • Gas laws re the laws that relates properties of gases such as pressure, temperature and volume at different conditions.
  • Gas laws includes, Boyle's law, Charles law, grahams law and pressure law among others.
  • Temperature is one of the quantity of gases explained by gas laws. For gas laws to work, temperature should always be in Kelvin. Therefore, when given temperature in degrees, it is converted to Kelvin by adding 273, that is °C + 273 = K.
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2 years ago
A physician may need to increase a patient's prescribed dosage if he or she has developed what?
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The answer to this question would be: resistance

When a patient developing a resistance to a certain drug, the same amount of doses will not exert the same effect as before. The effect will be lower, thus the doctor will need to increase the dose to increase the effect
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3 years ago
Help asap <br><br> i have to get a good grade on this
baherus [9]
I think The answer is 34.5l
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When 500 g of water is cooled from 80.0°C to 10.0°C, how much heat energy is lost?
vampirchik [111]

I don’t know

Explanation:

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