Hey guys I need help understanding this problem. If you can list why/reasoning for each step of the answer I would appreciate it greatly!
Interpret the given equation in terms of relatinve numbers of representative particles, number of moles, and masses of reactants and products.
2K(s)+2H2O(l)-->2KOH(Aq)+H2(g)
It look straight forward to me. I'll do one of them.
2 mols K + 2 mols H2O yield 2 mols KOH and 1 mol H2.
Now you can do the masses.
2*atomic mass K = 78 g K combine with 2*18 or 36 g H2O etc.
how many grams of solute is in 64.3 mL of 0.0238 molarity KOH?
mols = M x L. You know M and L, solve for mols.
Then mol = grams/molar mass.
You know mols and molar mass, solve for grams.
Sure! I can help you understand the given equation and explain the reasoning behind each step.
1. The equation you provided represents a chemical reaction between solid potassium (K) and liquid water (H2O). The reactants on the left side of the equation are potassium (K) and water (H2O).
2. The arrow in the middle of the equation means "yields" or "produces".
3. The products on the right side of the equation are potassium hydroxide (KOH) and hydrogen gas (H2). The KOH is in the aqueous state (Aq) and the hydrogen gas is represented as (g) for gas.
4. The number 2 in front of each reactant and product indicates the stoichiometry or the coefficient of each species. It tells you how many particles or moles of each substance are involved in the reaction. In this case, 2 moles of potassium (K) react with 2 moles of water (H2O) to produce 2 moles of potassium hydroxide (KOH) and 1 mole of hydrogen gas (H2).
5. The state of matter for each compound is indicated in parentheses after the chemical formula. "(s)" represents solid, "(l)" represents liquid, and "(g)" represents gas. "(Aq)" represents aqueous, which means it is dissolved in water.
6. You can determine the relative numbers of representative particles based on the coefficients in the balanced chemical equation. For example, the equation shows that 2 moles of potassium (K) react with 2 moles of water (H2O), producing 2 moles of potassium hydroxide (KOH) and 1 mole of hydrogen gas (H2).
7. Similarly, you can determine the relative masses of reactants and products using the molar masses of each substance. The molar mass is the mass of one mole of a substance. You can find the molar masses of the elements from the periodic table and calculate the molar masses of the compounds by adding up the molar masses of each element in the formula.
- The molar mass of potassium (K): 39.10 g/mol
- The molar mass of water (H2O): (2(1.01 g/mol) + 16.00 g/mol) = 18.02 g/mol
- The molar mass of potassium hydroxide (KOH): (39.10 g/mol + 16.00 g/mol + 1.01 g/mol) = 56.11 g/mol
- The molar mass of hydrogen gas (H2): 2(1.01 g/mol) = 2.02 g/mol
8. By using the stoichiometry and molar masses, you can convert the number of moles to masses. For example, if you have 2 moles of potassium (K), you can multiply it by its molar mass (39.10 g/mol) to obtain its mass.
I hope this explanation helps you understand the given equation and the reasoning behind each step! If you have any further questions, feel free to ask.