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sattari [20]
3 years ago
9

Which of the following is a solution? Steel Milk Plastic Water

Chemistry
1 answer:
Anit [1.1K]3 years ago
4 0
Milk. Everything else is a compound/alloy.
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An excess of mg(s) is added to 100.ml of 0.400 m hcl. at 0c and 1 atm pressure, what volume of h 2 (g) can be obtained?
ra1l [238]
The balanced equation for the reaction between Mg and HCl is as follows
Mg + 2HCl --> MgCl₂ + H₂
stoichiometry of HCl to H₂ is 2:1

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since Mg is in excess HCl is the limiting reactant 
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we can use ideal gas law equation to find the volume of H₂
PV = nRT 
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V - volume
n - number of moles - 0.02 mol
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature in Kelvin - 0 °C + 273 = 273 K
substituting these values in the equation 

101 325 Pa x V = 0.02 mol x 8.314 Jmol⁻¹K⁻¹ x 273 K
V = 448 x 10⁻⁶ m³
V = 448 mL 
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c. 448 mL 
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