Question

A solution of zinc chloride, ZnCl2, in water is used to soak the ends of wooden fenceposts to preserve them from rotting while they are stuck in the ground.One ratio used is 840 grams ZnCl2 to 4 L water.How many moles of ZnCl2 are in840 grams of ZnCl2?​

Answer 1

Nahh this one lowkey difficult

The molar mass of ZnCl2 can be calculated by adding up the atomic masses of zinc (Zn) and chlorine (Cl). The atomic mass of zinc is 65.38 grams/mol, and the atomic mass of chlorine is 35.45 grams/mol (approximately).

Molar mass of ZnCl2 = (1 * atomic mass of Zn) + (2 * atomic mass of Cl)

= (1 * 65.38 g/mol) + (2 * 35.45 g/mol)

= 65.38 g/mol + 70.90 g/mol

= 136.28 g/mol

Now, we can calculate the number of moles of ZnCl2 in 840 grams using the formula:

Number of moles = Mass (in grams) / Molar mass

Number of moles = 840 g / 136.28 g/mol

= 6.16 mol (approximately)

Therefore, there are approximately 6.16 moles of ZnCl2 in 840 grams of ZnCl2.