The density of oxygen gas is 1.429 × 10–3 g/cm3 at standard conditions. what would be the percent error of the average of two separate experimental determinations measuring 1.112 × 10–3 g/cm3 and 1.069 × 10–3 g/cm3? (to solve this problem, average the two readings before calculating the percent error.)

0.034%

Explanation:

First, let's calculated the average density (da) of the two experimental, which the sum of them divided by 2:

da = 1.090x10⁻³ g/cm³

The relative error is given by the difference of the correct value and the avarege, divided by the correct value:

e = 3.39x10⁻⁴ x 100%

e = 0.034%

58 km per hour : d

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.