Question

1. mg (s) + zncl₂ (aq) ---> mgcl₂ (aq) + zn (s)

45.0 g 297.6 g 176.5 g? g

1. kclo₃ ---> kcl + o₂

if 125 g of kclo₃ is heated, what is the total mass of the products?
products or reactants????

1. mg (s) + zncl₂ (aq) ---> mgcl₂ (aq) + zn (s)

what is the single element reactant in the reaction above?

1. kclo₃ ---> kcl + o₂

what is the compound that is also a product of the reaction above?

1. 2kclo₃ ---> 2kcl + 3o₂

what is the coefficient of the element in the reaction?

Explanation:

Step1: Apply the law of conservation of mass

According to the law of conservation of mass, the mass of reactants is equal to the mass of products in a chemical reaction.

Step2: Calculate the mass of \(Zn\)

For the reaction \(Mg_{(s)}+ZnCl_{2(aq)}\to MgCl_{2(aq)}+Zn_{(s)}\), the mass of reactants is \(45.0\ g + 297.6\ g=342.6\ g\). The mass of \(MgCl_{2}\) is \(176.5\ g\). Let the mass of \(Zn\) be \(x\). Then \(342.6\ g=176.5\ g + x\). Solving for \(x\), we get \(x = 342.6\ g-176.5\ g = 166.1\ g\)

Step3: Answer for question 8

For the reaction \(KClO_{3}\to KCl + O_{2}\), using the law of conservation of mass, if \(125\ g\) of \(KClO_{3}\) is heated (reactant), the total mass of products (\(KCl\) and \(O_{2}\)) is \(125\ g\)

Step4: Answer for question 9

In the reaction \(Mg_{(s)}+ZnCl_{2(aq)}\to MgCl_{2(aq)}+Zn_{(s)}\), the single - element reactant is \(Mg\) (magnesium). Elements are substances made of only one type of atom. \(MgCl_{2}\) and \(ZnCl_{2}\) are compounds (made of more than one type of atom)

Step5: Answer for question 10

In the reaction \(KClO_{3}\to KCl + O_{2}\), \(O_{2}\) is an element (\(O\) atoms) and \(KCl\) is a compound (made of \(K\) and \(Cl\) atoms). So the compound that is a product is \(KCl\)

Step6: Answer for question 11

In the reaction \(2KClO_{3}\to 2KCl + 3O_{2}\), the element is \(O_{2}\). The coefficient of \(O_{2}\) is \(3\)

Answer:

1. \(166.1\ g\)
2. \(125\ g\)
3. \(Mg\)
4. \(KCl\)
5. \(3\)