Q: How many molecules are there in 3.24 g of nicotine ($$\mathrm{C$$_{10}$$H_{14}N$$_{2}}$)? (Molar mass = 162.23 g/mol)

$$1.20 \times 10$$^{22}$$ molecules

Q: A dentist uses 0.0400 mol of procaine ($$\mathrm{C$$_{13}$$H_{20}N$$_{2}$$O_{2}}). $$How many molecules of procaine is this?

$$2.41 \times 10$$^{22}$$ molecules

Question 1

How many carbon atoms are present in 0.37 mol of procaine ($$\mathrm{C$$_{13}$$H_{20}N$$_{2}$$O_{2}}$$)?

Accepted Answer

$$2.9 	imes 10$$^{24}$$ atoms

Question 2

How many molecules are there in 3.24 g of nicotine ($$\mathrm{C$$_{10}$$H_{14}N$$_{2}}$)? (Molar mass = 162.23 g/mol)

Accepted Answer

$$1.20 	imes 10$$^{22}$$ molecules

Question 3

According to the principle 'like dissolves like', is carbon tetrachloride ($$\mathrm{$$CCl_4$$}) $$soluble in ethanol (a polar solvent)?

Accepted Answer

No

Question 4

How many moles of oxygen atoms are in 21.4 moles of TNT ($$\mathrm{C_7H_5N_3O_6}$$)?

Accepted Answer

128 atoms

Question 5

How many moles of nitrogen atoms are in 21.4 moles of TNT ($$\mathrm{C_7H_5N_3O_6}$$)?

Accepted Answer

64.2 atoms

Question 6

In the reaction $$2\mathrm{Al}(s) + 3\mathrm{Cl}_2(g) \rightarrow 2\mathrm{AlCl}_3(s)$$, what mass of chlorine gas is required to react completely with 72.5 g of aluminum?

Accepted Answer

286 g

Question 7

Calculate the mass, in grams, of $$8.35 	imes 10$$^{22}$$ molecules of $$\mathrm{$$CBr_4$$}$$ (molar mass = 395.7 g/mol).

Accepted Answer

46.0 g

Question 8

The solubility of KBr is 80 g/100 g of water. If 10.83 g KBr is added to 38.84 g of water, is the solution saturated, unsaturated, or supersaturated?

Accepted Answer

Unsaturated

Question 9

A 180.2 g sample of glucose ($$\mathrm{C_6H_{12}O_6$}) $$undergoes fermentation: $$\mathrm{C_6H_{12}O_6$} \rightarrow 2\mathrm{C_2H_5OH} + 2\mathrm{CO_2$}. If 67.7 g of $$ethanol ($$\mathrm{C_2H_5OH}) is $$obtained, what is the percent yield?

Accepted Answer

73.5%

Question 10

In a chemical reaction, mass is conserved (neither created nor destroyed). Is this statement true or false?

Accepted Answer

True

Question 11

Nitroglycerin ($$\mathrm{C_3H_5N_3O_9}) $$explodes according to: $$4\mathrm{C_3H_5N_3O_9} \rightarrow 6\mathrm{N_2$} + 12\mathrm{CO_2$} + 10\mathrm{H_2O} + O_2$. How many moles of $$\mathrm{$$CO_2$$}$$ are produced from 4.0 moles of nitroglycerin?

Accepted Answer

12 moles

Question 12

Aluminum oxide ($$\mathrm{Al_2O_3}) is $$used as a filler for paints. Calculate the number of moles in 47.51 g of $$\mathrm{Al_2O_3} ($$molar mass = 101.96 g/mol).

Accepted Answer

0.4660 mol

Question 13

If 3.00 moles of $$\mathrm{NH_3$}$$ and 4.00 moles of $$\mathrm{O_2$}$$ react in $$4\mathrm{NH_3$} + 5\mathrm{O_2$} \rightarrow 4\mathrm{NO} + 6\mathrm{H_2O}$$, how many moles of $$\mathrm{H_2O}$$ will be formed?

Accepted Answer

4.50 moles

Question 14

How many grams of $$\mathrm{Cl_2$}$$ can be prepared from the reaction of 16.0 g of $$\mathrm{$$MnO_2$$}$$ and 30.0 g of $$\mathrm{HCl}$$ according to $$\mathrm{$$MnO_2$$} + 4\mathrm{HCl} \rightarrow \mathrm{$$MnCl_2$$} + \mathrm{Cl_2$} + 2\mathrm{H_2O}$$?

Accepted Answer

13.0 g

Question 15

If 70.27 g of ethylene ($$\mathrm{C_2H_4}) $$reacts with excess water to form ethanol ($$\mathrm{C_2H_5OH}$$), what is the percent yield if only 51.8 g of ethanol are actually formed? (Molar masses: $$\mathrm{C_2H_4} = 28.06 g/$$mol, $$\mathrm{C_2H_5OH} = 46.08 g/$$mol)

Accepted Answer

66.0

Question 16

What is the coefficient of $$\mathrm{H_2O}$$ when the equation $$\mathrm{$$PCl_3$$}(l) + \mathrm{H_2O}(l) \rightarrow \mathrm{H_3PO_3}(aq) + \mathrm{HCl}(aq) is $$properly balanced?

Accepted Answer

1

Question 17

A patient receives 0.2788 mol of a drug. If the molar mass of the drug is 250 g/mol, what mass of the drug did the patient receive?

Accepted Answer

69.7 g

Question 18

Which of the following statements best explains why nitroglycerin is a powerful explosive?

Accepted Answer

It produces a large amount of heat and many gaseous products, causing rapid expansion.

Question 19

A dentist uses 0.0400 mol of procaine ($$\mathrm{C$$_{13}$$H_{20}N$$_{2}$$O_{2}}). $$How many molecules of procaine is this?

Accepted Answer

$$2.41 	imes 10$$^{22}$$ molecules

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