Compare the activity of sodium and iron with water and dilute acid

Reactions of sodium with water and dilute acid

Sodium reacts explosively with dilute HCl(aq) to produce NaCl(aq) and H₂(g)

2Na (s) + 2HCl(aq) → 2NaCl(aq) + H₂(g)

Sodium reacts violently with cold water to produce NaOH(aq) and H₂(g)

2Na (s) + H₂O(l)  → 2Na(OH)(aq) + H₂(g)

The produced hydrogen may become ignited and explode

Reactions of iron with water and dilute acid

Iron reacts very slowly with dilute acid to produce iron (II) chloride and hydrogen gas

Fe (s) + 2 HCl (aq) →  FeCl₂ (aq) + H₂ (g)

Iron does not react with cold water. Iron reacts only with steam

Explanation:

what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%