This the chemical equation of the reaction of Al and HCl
Al + HCl → AlCl3 + H2 (g)
When you balance the atomos you get:
2Al + 6HCl → 2AlCl3 + 3H2 (g) ------- you can check that here you have the same number of atoms of Al, H, and Cl in both sides.
The coefficients are:
2 for Al, 6 for HCl, 2 for AlCl3 , and 3 for H2.
Then, the answer is: the coefficient of HCl is 6
Answer:
The atomic number of an element is the number of protons found in the nucleus of every atom of that element. Atomic number and is used to distinguish one element from another . The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).
While, Mass number (atomic mass number or nucleon number), is the total number of protons and neutrons in an atomic nucleus. It is said to be approximately equal to the atomic mass of the atom expressed in atomic mass units.
Explanation:
In simple words ;
mass number = protons + neutrons
Atomic number = no of protons
1 mole ------------ 6.02x10²³ atoms
5.88 moles ---- ?
atoms = 5.88 * 6.02x10²³ / 1
= 3.539x10²⁴ atoms
hope this helps!
Answer:
2°C.
Explanation:
Considering the thermometer used in this case, we can see that there are 5 lines counting from 0 to 10.
It therefore means that 1 line indicates 2°C.
With the above insight, the thermometer reads 2°C.
Therefore, the temperature of the water is 2°C.
Answer:
(1) See below, (2) About 8.4 pH, (3) About 3.981 * 10⁻⁶ mol dm⁻³
Explanation:
1. A buffer is a solution that resist pH when adding a basic or acidic compound. It's purpose is to neutralize added acids and bases.
2. Remember that the formula for pH is -log [H+]. We have a 0.1 M solution of baking soda in water with [H+] of about 4.0 × 10⁻⁹. Therefore we can calculate the pH as follows...
pH = -log (4.0 × 10⁻⁹)
pH = -(-8.39794...) = (About) 8.4 pH of 0.1 M of baking soda
3. This question has a similar set up...
pH = -log [H+]
[H+] = inverse of log^- pH
[H+] = 10^-5.4 = (About) 3.981 10⁻⁶