How many grams of mgo are produced when 40.0 grams of o2 react completely with mg? 2 mg (s) + o2 (g) → 2 mgo (s)?

Magnesium is a chemical element, which have molar mass of 15 u. It reacts with oxygen to form magnesium oxide, MgO. The molar mass of oxygen is 16 u. The number of grams of MgO produced will be 100 grams.

Given that,

Now, the balanced chemical equation between magnesium and oxygen is:

Stoichiometrically, in the reaction,  1 molecule of oxygen gives 2 MgO.

As in the reaction:

40 g of Oxygen react to give:

Therefore, 100 g of MgO will be produced when 40 g of Oxygen reacts with Magnesium.

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100 grams

Explanation: -

Mass of Oxygen = 40 g

Chemical formula of oxygen gas = O2

Molar mass of oxygen = 16 x 2 = 32 gram

Atomic mass of Mg = 24g

Molar mass of MgO = 24 x 1 + 16 x 1 =40 gram

The balanced chemical equation for the reaction is

2Mg + O2 -- > 2 MgO

So from the balanced equation we see that 1 O2 react to give 2 MgO

32 grams of O2 react to give 2 x 40 gram of MgO

40 grams of O2 react to give

=100 gram of MgO

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

i just learnt this recently but i need to look through my notes again