Achemical reaction takes place among 3 molecular ions that have each lost 2 electrons, 2 molecular ions that have each gained 3 electrons, and 1 molecular ion that has gained 2 electrons. the products of the reaction are two neutral molecules and multiple molecular ions that each have a charge of magnitude e. how many molecular ions are produced, and are they charged positively or negatively?

2 molecular ions are produced and they are charged negatively

Explanation:

If an ion loses an electron then its charge is +1, if it gains an electron then its charge is -1

3 molecular ions lost 2 electrons each, each ion is charged +2

Total charge = 3(+2) = +6

2 molecular ions gained 3 electrons each, each ion is charged -3

Total charge = 2(-3) = -6

1 molarcular ion gained 2 electrons, ion is charged -2

Net charge of the reactants is:

+6 -6 -2 = -2

The net charge of the reactants must be the same as the net charge of the products.

In the products you have 2 neutral molecules (with charge 0) and molecular ions with a charge of magnitude e.

Since the net charge in the reactants is negative, the net charge in the products is also negative

If the number of molecular ions in the products is x then its total charge is:

x*(-1) = -2

x = 2

when 25.0 ml of 0.700 mol/l naoh was mixed in a calorimeter with 25.0 ml of 0.700 mol/l hcl, both initially at 20.0 °c, the temperature increased to 22.1 °c. the heat capacity of the calorimeter is 279 j/°c.

the equation for the reaction is:

naoh + hcl → nacl + h₂o

moles of hcl = 0.0250 l hcl ×

0.700

mol hcl

1 l hcl = 0.0175 mol hcl

volume of solution = (25.0 + 25.0) ml = 50.0 ml

mass of solution = 50.0 ml soln ×

1.00

ml soln

= 50.0 g soln

δt=t2-t1

= (22.1 – 20.0) °c = 2.1 °c

the heats involved are

heat from neutralization + heat to warm solution + heat to warm calorimeter = 0

q1+q2+q3=0

nδh+mcδt+cδt=0

0.0175 mol ×

δh

+ 50.0 g × 4.184 j·g⁻¹°c⁻¹ × 2.1 °c + 279 j°c⁻¹ × 2.1 °c = 0

0.0175 mol ×

δh

+ 439.32 j + 585.9 j = 0

0.0175 mol ×

δh

= -1025.22 j

δh=1025.22j0.0175 mol= -58 600 j/mol = -58.6 kj/mol

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.