2 years ago

Which group of the periodic table contains two elements that are gases at stp?

Chemistry

1 answer:

Svetradugi [14.3K]2 years ago

3 0

The group is might be labeled as VIIB or VIIA.

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In the current model of the atom, ___. electrons and protons are mixed together in a solid sphere electrons orbit around the pos

kati45 [8]

Neutrons and protons are in the nucleus
electrons are on shells which orbit the nucleus

5 0

2 years ago

When 1 mole of H2(g) reacts with F2(g) to form HF(g) according to the following equation, 542 kJ of energy are evolved H2(g) + F

topjm [15]

Answer: The reaction is exothermic. The value of q is -542 kJ.

Explanation:

Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and for the reaction comes out to be positive.

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and for the reaction comes out to be negative.

Thus $H_2(g)+F_2(g)\rightarrow 2HF(g)$ evolves heat , it is exothermic in nature. The value of q is -542kJ.