A molecule contains five atoms and has a molecular weight of 85 g per mole. the atoms are of elements with atomic numbers 1, 6,
and 17. which molecular structure could represent this molecule?
1 answer:
Answer:
Dichloromethane
Explanation:
As we know the atomic number given belongs to following elements, i.e.
Atomic # Element M.Mass
1 Hydrogen 1 g.mol⁻¹
6 Carbon 12 g.mol⁻¹
17 Chlorine 35.5 g.mol⁻¹
Also the molecular formula of Dichloromethane is,
= CH₂Cl₂
Putting molar masses of each element,
= (12)₁ + (1)₂ + (35.5)₂
= 12 + 2 + 71
= 85 g.mol⁺¹
Result:
Hence the only possible structure containing 5 atoms is Dichloromethane.
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<u>Answer:</u> The mass or zinc reacted is 0.624 grams.
<u>Explanation:</u>
We are given:
Total pressure = 1.032 atm
Vapor pressure of water = 32 torr = 0.042 atm (Conversion factor: 1 atm = 760 torr)
To calculate partial pressure of hydrogen gas, we use the equation:
To calculate the number of moles of hydrogen gas, we use the equation given by ideal gas follows:
where,
P = pressure of hydrogen gas = 0.99 atm
V = Volume of hydrogen gas = 240. mL = 0.240 L (Conversion factor: 1 L = 1000 mL)
T = Temperature of hydrogen gas =
R = Gas constant =
n = number of moles of hydrogen gas = ?
Putting values in above equation, we get:
The chemical equation for the reaction of zinc and hydrochloric acid follows:
By Stoichiometry of the reaction:
1 mole of hydrogen gas is produced from 1 mole of zinc metal
So, of hydrogen gas is produced from =
of zinc metal
To calculate the mass of zinc metal, we use the equation:
Molar mass of zinc = 65.38 g/mol
Moles of zinc = moles
Putting values in above equation, we get:
Hence, the mass or zinc reacted is 0.624 grams.