Answer:
I think it will be He, and Cl2
5.5 grams of reactants. According to the Law of Conservation of Mass, mass isn’t created or lost through any chemical changes, so the total mass should remain constant from the initial reactants to the final products.
1) Balanced chemical equation:
<span>C(s)+O2(g)→CO2(g), δh∘rxn=−393.5kj
2) Meaning: When burned 1 mol of C(s), this is solid pure charcoal, produces 1 mol of CO2 and liberates 393.5 kJ of heat
Ratio: 1 mol CO2 : 393.5 kJ
3) Proportion:
1 mol CO2 x
--------------- = -------------------
393.5 kJ 4.6 * 10^2 kJ
4) Solve for x:
x = 460 kJ * 1 mol CO2 / 393.5 kJ = 1.1690 mol CO2
5) convert moles to grams
mass in grams = number of moles * molar mass
mass in grams = 1.1690 mol * 44.01 g / mol = 51.4 g
Answer: 51.4 g
</span>
SF6.............................................
Answer:
D. Electrons: Negative.
Explanation:
Hello, happy to help you today!
In this case, by considering the Bohr's atomic model in which atom is composed by a nuclei containing both protons and neutrons which are positively and neutrally charged respectively and surrounding electrons assembled in orbits or levels of energy which are negatively charged in order to provide a balance to the atom, the correct statement is: D. Electrons: Negative. Also consider the Bohr's model on the attached picture.
My best regards to you!
