No. The number of a protons is not equal to it's atomic weight, instead it is equal to the 'atomic number'
E. Double Replacement
The OH replaces the Cl, and the Cl replaces the OH
Answer:
a. BH₃
Explanation:
According to the octet rules, atoms reach stability when are surrounded by eight electrons in their valence shell when they combine to form a chemical compound.
From the options, the only compound in which the central atom does not meet the octet rules is BH₃. The central atom is boron (B), which has 3 electrons in its valence shell. When B is combined with hydrogen (H), 3 electrons from the 3 atoms of H are added. <em>The total amount of electrons is 6</em>, <em>fewer than 8 electrons</em> needed to meet the rule.
The balanced chemical reaction is expressed as:
<span>2Al(s)+3Cl2(g)→2AlCl3(s)
To determine the volume of chlorine gas needed given the mass of aluminum metal to be used, we need to calculate for the moles of chlorine needed and use a relation that relates moles and volume by assuming the gas to be an ideal gas. We use the equation PV =nRT. We calculate as follows:
7.85 g Al ( 1 mol / 26.98 g ) ( 3 mol Cl2 / 2 mol Al ) = 0.43643 mol Cl2
PV = nRT
V = nRT / P
V = 0.43643 (0.08205) (298) / (225/760)
V = 36.04 L chlorine gas
The minimum volume needed would be 36.04 L.</span>
Answer: 8 moles of hydrogen reacts with 1 mole of sulfur.
Explanation: We are given a balanced chemical equation:
By Stoichiometry, it is said that
8 moles of Hydrogen gas reacts with 1 mole of sulfur to produce 8 moles of hydrogen sulfide.
Mole ratio of reactants = Hydrogen : Sulfur = 8 : 1
