Honors Stoich A (Study Guide Review)

Balancing Equations/Polyatomic Ions

100

Balanced the equation:

___ KCl + ___ Mg₃N₂ --> ____ K₃N + ____ MgCl₂

Then, determine how many moles you have of each compound.

6 moles of KCl

1 mol of Mg₃N₂

2 moles of K₃N

3 moles of MgCl₂

200

Balance the equation:

1 CaF₂ + 2 K --> 2 KF + 1 Ca

Then, determine how many moles you have of each compound.

1 mole of CaF₂

2 moles of K

2 moles of KF

1 mole of Ca

300

What is the formula and charge for the polyatomic ion Sulfate?

(SO₄)^-2

400

What is the formula and charge for the polyatomic ion Carbonate?

(CO₃)^-2

500

What is the formula and charge for the polyatomic ion Phosphate?

(PO₄)^-3

More Polyatomic Ions

100

What is the formula and charge for the polyatomic ion Ammonium?

(NH₄)⁺¹

200

What is the formula and charge for the polyatomic ion Bicarbonate?

(HCO₃)^-1

300

What is the formula and charge for the polyatomic ion Hydroxide?

(OH)^-1

400

What is the formula and charge for the polyatomic ion Chlorate? 

(ClO₃)^-1

500

What is the formula and charge for the polyatomic ion Nitrate?

(NO₃)^-1

Moles --> Grams & Grams --> Moles

100

If you have 2 moles of K, how many grams is this? Record your answer to the correct number of sig figs.

78.20 grams

200

If you have 2 moles of KF, how many grams is this? Record your answer to the correct number of sig figs.

116.2 grams

300

If you have 6 moles of KCl, how many grams is this? Record your answer to the correct number of sig figs.

447.3 grams

400

If you have 2 moles of K₃N, how many grams is this?

If you have 3 moles of MgCl₂, how many grams is this?

Record BOTH answers to the correct number of sig figs.

262.62 grams of K₃N

285.6 grams of MgCl₂

500

If you have 3060 grams of Al₂O₃, how many moles is this? Record your answer to the correct number of sig figs.

30.0 moles of Al₂O₃

Moles --> Atoms & Atoms --> Moles

100

If you have 2 moles of K₃N, how many particles are there? Record your answer to the correct number of sig figs.

1.204 x 10²⁴ particles

200

If you have 3 moles of MgCl₂, how many particles are there? Record your answer to the correct number of sig figs.

1.807 x 10²⁴ particles

300

If you have 6 moles of KCl, how many particles are there? Record your answer to the correct number of sig figs.

3.613 x 10²⁴ particles

400

What is the formula and charge for the polyatomic ion Cyanide?

(CN)^-1

500

What is the formula and charge for the polyatomic ion Peroxide?

(O₂)^-2

Grams-->Moles-->Atoms &Atoms -->Moles--> Grams &Sig Figs

100

How many sig figs are in the number 0.0040300?

5 sig figs.

200

How many sig figs are in the number 100.020?

6 sig figs

300

Convert 56 grams of KF into particles. Record your answer to the correct number of sig figs.

5.8 x 10²³ particles

400

Convert 279.45 grams of MgCl2 into particles. Record your answer to the correct number of sig figs.

1.768 x 10²⁴ particles

500

If you have (4.22 x 10²⁵) particles of Na₂S, how many grams is that? Record your answer to the correct number of sig figs.

5.47 x 10³ grams OR 5470 grams