<h2>
Answer:</h2>
We will need to know Avogadro's number and the molar mass of sucrose for this problem to do dimensional analysis.
- Avogadro's number: 6.022 × 10²³ molecules
- Molar mass of sucrose: 342.2965 g/mol
250g × × = 4.398 molecules
There are <em>4.398 sucrose molecules </em>in 250 grams of sucrose.
Chemical formulas for ionic compounds are written in lowest common multiples of the charges of each ion. This is true unlike covalent compounds where the transformation to lowest common multiple is not applicable such that this reflects to the naming of covalent compounds using prefixes mono-, di-, tri-, tetra-, etc. Answer is a.
El ácido sulfúrico es un ácido fuerte y por eso disocia completamente. La concentración de H+ será igual a la concentración de ácido sulfúrico (0.000475 M).
Para encontrar el pH, calcula -log[H+] = -log(0.000475) = 3.323
Para encontrar el pOH, sabes que pH + pOH = 14, y por eso pOH = 14 - pH = 14 - 3.323 = 10.677.
Answer:
18.52g
Explanation:
(relative atomic masses: H = 1.01, O = 16.00, Ca = 40.08)
Equation (balanced):
Ca + 2H2O -> Ca(OH)2 +H2
First, calculate the number of moles of 10g calcium
No. of moles of Ca = 10/40.08 = 0.25 mol
Then, calculate the number of moles of 20g water
No of moles of H2O = 1.11 mol
According to the balanced equation, 1 mole of calcium reacts with 2 moles of H2O completely. Therefore, H2O is in excess.
So, 1 mole of calcium reacts with water to form 1 mole of Ca(OH)2 (according to the mole ratio shown in the balanced equation)
Therefore, 0.25 mol of Ca(OH)2 is produced.
Mass of Ca(OH)2 produced = no. of moles x molar mass = 0.25 x (40.08 + 16 + 16 + 1.01 + 1.01) = 18.52g
Good luck!