How many grams of magnesium oxide can be produced if 2.490 Mg react with excess oxygen?

2.49g of Mg will produce 4.13g of MgO

Explanation:

2Mg(s) + O2(g) → 2MgO(s) + energy

Molecular weight of Mg = 24.305 g/mol

Molecular mass of MgO = 40.3044 g/mol

According to the question,

2 X 24.305g of Mg will produce 2 X 40.3044 g of MgO

2.490 g of Mg will produce = of MgO

                                              = 4.13g of MgO

Therefore, 2.49g of Mg will produce 4.13g of MgO

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.