Question

Ca + 2H2O → Ca(OH)2 + H2
Elemental calcium reacts with water at room temperature to form calcium hydroxide and hydrogen gas as shown in this equation. Sodium undergoes a similar reaction with H2O. What would be the coefficient for sodium in a similar reaction?
A) 1
B) 2
C) 3
D) 4

Answer 1

Thew  coefficient    for  sodium  in a  similar reaction   is   2 (answer B)

    Explanation

write  a  balanced  chemical  equation   between    sodium and water.

2 Na+ 2 H2O→  2NaOH +H2

coefficient is the number in front   of  a chemical formula.  it tell  how  many  molecules   or atoms of  a  given formula that  are  involved  in a  chemical equation.

The  coefficient  of Na  is 2  since  the   number in front  of Na  in  equation above is 2

Answer 2

The answer is B) 2]

Hope this helps