Answer: 15.1 grams
Given reaction:
Na2CO3 + Ca(OH)2 → 2NaOH + CaCO3
Mass of Na2CO3 = 20.0 g
Molar mass of Na2CO3 = 105.985 g/mol
# moles of Na2CO3 = 20/105.985 = 0.1887 moles
Based on the reaction stoichiometry: 1 mole of Na2CO3 produces 2 moles of NaOH
# moles of NaOH produced = 0.1887*2 = 0.3774 moles
Molar mass of NaOH = 22.989 + 15.999 + 1.008 = 39.996 g/mol
Mass of NaOH produced = 0.3774*39.996 = 15.09 grams
Explanation:
When the concentration is expressed in percent, then that would represent the amount of solute per 100 of the amount of the solution. For 5% sucrose solution, that is 5 g sucrose per 100 g solution. Assuming there is 100 g of solution, the moles of solute is determined using the molar mass of sucrose equal to 342.3 g/mol.
Amount of moles = 5 g sucrose * 1 mol/342.3 g = 0.0146 moles sucrose
The concentration in molarity is the moles of solute per liter solution. Since the solution is very dilute, then we can assume that the density of the solution is almost equal to that of water which is 1,000 g/L.
Molarity = 0.0146 moles/[100g solution * 1 L/1,000 g]
Molarity = 0.146 M sucrose solution
Answer: A. Earth is an inner planet with a solid rock surface composition, while Jupiter is an outer planet with a gas surface composition.
Everywhere
Hope that helps and good luck
~May
Explanation:
To balance any chemical equation, you must first understand the law of conservation of mass.
The law of conservation of mass states that "atoms are neither created nor destroyed in a chemical reaction but are changed from one form to another".
So in any chemical reaction the number atoms on both sides of the equation must be the same.
To balance a chemical equation:
- you can inspect the given equation and fix appropriate whole number coefficient to chemical species that are not balanced.
- Also you can set up simple and solvable algebraic equations.
For example:
aNa + bCl₂ → cNaCl
a, b and c are the coefficients that will balance the equation;
conserving: Na a = c
Cl 2b = c
let b = 1
c = 2
a = 2
2Na + Cl₂ → 2NaCl
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Balanced equation brainly.com/question/2947744
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