Help please I have no I deal what im doing

Question

1. For the following UNBALANCED reaction what is the mole ratio of H,O to B(OH),?

BO (+ HOB(OH),

A. 3 H 0:2 B(OH),

B. 2 H20 : 3 B(OH), C. 2 H,0:1 B(OH), D. 1 H,0:1 B(OH)

2. Lead(II) sulfide, Pbs, reacts with oxygen gas to produce lead(II) oxide and sulfur

dioxide.

2PbS + 302 - 2PbO + 2502

If 0.500 moles of O, were consumed using this chemical reaction, how many moles of

PbO would be produced?

A.

0.38 mol

B. 0.75 mol

C. 0.67 mol

D. 0.33 mol

3. Potassium chlorate, KCIOy, decomposes when heated to produce potassium chloride

and oxygen gas.

2KCIO, 2KCI + 302

If 2.50 grams of Kao, were heated in a test tube, how many moles of O, should be

given off?

A. 0.02 moles B. 0.04 moles C. 0.06 moles D. 0.03 moles

4. If 0.79 moles of Al is reacted with Fe,Os, the products will be Al,0, and Fe. What mass

of Fe will be produced?

2A1 + 1Fe 0,1A,O, + 2Fe

What mass of Fe will be produced?

A.

31.9 g

B. 63.9 g

C. 44.2 g

D. 22.1 g

5. How many moles of hydrogen (H) will react with 2.50 moles of hydrochloric acid (HCI)?

Mg . + 2 HĆI (4) Mgá, () + H

A. 1.25 moles HR

B. 2.50 moles H, C. 5.00 moles H

D. 7.50 moles H

Answer 1

I can help with part of this. I don't understand what the reactions are for questions 1 and 5.

2) 2 PbS + 3 O₂ --> 2 PbO + 2 SO₂, (0.500mol O₂) * (2 mol PbO / 3 mol O₂) = 0.333 mol PbO [answer D].

3) 2 KClO₃ --> 2 KCl + 3 O₂, (2.50g KClO₃) * (1 mol KClO₃ /122.5g KClO₃) * (3 mol O₂ / 2 mol KClO₃) = 0.0306 mol O₂ [D].

4) 2 Al + Fe₂O₃ --> Al₂O₃ + 2 Fe, (0.79 mol Al) * (2 mol Fe / 2 mol Al) * ( 55.85g Fe / 1 mol Fe) = 44.1g Fe [C].