Question

I am sorry for posting more than one question here. I am having a lot of difficulty with this homework (it's actually not for a grade but I need it to check my understanding of the material) and I'm running out of questions I can ask for this period. Any help would be appreciated. Thank you so much in advance for your time.

1.

Consider the reaction: 2Na   +   Cl2   →   2 NaCl

Calculate the amount (in grams) of Cl₂ needed to make 117 grams of NaCl?

	A.	35.5
	B.	71.0
	C.	142
	D.	None of these choices is correct
	E.	48.2

2.

What are the coefficients for the following reaction when it is properly balanced?

___NO + ___CO → ___N₂ +___CO₂

	A.	2, 2, 2, 1
	B.	2, 2, 1, 2
	C.	2, 1, 1, 2
	D.	None of these choices is correct
	E.	1, 1, 2, 2

3.

Determine the coefficients for the following reaction when it is properly balanced?

___K3PO4 + ___Ca(NO3)2 → ___KNO3 + ___Ca3(PO4)2

	A.	None of these choices is correct
	B.	2, 1, 1, 3
	C.	2, 3, 6, 1
	D.	2, 3, 1, 6
	E.	6, 1, 3, 2

4.

Given that 4 NH3 + 5 O2 → 4 NO + 6 H2O, when 4.50 mol of H2O are formed, the amount of NO formed is _________.

	A.	None of these choices is correct
	B.	6.75 mol
	C.	3.00 mol
	D.	4.50 mol
	E.	1.50 mol

5.

Consider the reaction: CO2   +   2 KOH   →   K2CO3   +   H2O

Determine the limiting reactant when 42.0 g of CO2 are mixed with 99.9 g of KOH.

	A.	CO2
	B.	H2O
	C.	None of these choices is correct
	D.	K2CO3
	E.	KOH

6.

Consider the reaction: N2 + 3 H2 → 2 NH3

What is the percent yield for the reaction if 24 g N₂ reacted with excess of H₂ to produce 3.85 g NH₃?

	A.	13.2%
	B.	86.8%
	C.	73.6%
	D.	None of these choices is correct
	E.	26.4%

7.

Consider the reaction: 4 NH3 + 5 O2 → 4 NO + 6 H2O

Calculate the percent yield for the reaction if a sample of 8.5 g NH3 produces 9.0 g of NO.

	A.	70%
	B.	60%
	C.	15%
	D.	None of these choices is correct
	E.	30%

8.

The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0g. What is the percent yield?

	A.	None of these choices is correct
	B.	178
	C.	56.0
	D.	75.0
	E.	31.5

9.

Consider the reaction: 2 H2   +   O2   →   2 H2O

Calculate the number of moles of water formed from the complete reaction of 1.4 moles of hydrogen?

	A.	None of these choices is correct
	B.	2.8
	C.	2.1
	D.	0.7
	E.	1.4