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

The answer is B) 2]

Hope this helps

Answer 2

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