Question

Part C

Calculate the molar mass of acetylcholine (C7NH16O2), a neurotransmitter that activates muscles.

Express your answer to five significant figures.

Molar mass =

  g/mol  

Calculate the number of moles in 3.47 g of each of the following:

Part A

He

Express your answer with the appropriate units. n=

Part B

SnO2

Express your answer with the appropriate units. n=

Part C

Cr(OH)3

Express your answer with the appropriate units. n=

Part D

Ca3N2

Express your answer with the appropriate units. n=

How many moles of C are in each of the following quantities?

Part A

71 g of C

Express your answer using two significant figures.

  moles  

Part B

0.30 mole of C2H6

Express your answer using two significant figures.

  moles  

Part C

83 g of CO2

Express your answer using two significant figures.

  moles  

Dinitrogen oxide (or nitrous oxide), N2O, also known as laughing gas, is widely used as an anesthetic in dentistry.

Part A

How many grams of the compound are in 1.90 moles of N2O?

mN2O=

  g

Part B

How many moles of the compound are in 35.2 g of N2O?

νN2O=

  mol  

Part C

How many grams of N are in 35.2 g of N2O?

mN=

  g

In the body, the amino acid glycine, C2H5NO2, reacts according to the following equation:

2C2H5NO2(aq)	+3O2(g)⟶
Glycine	3CO2(g)+3H2O(l)+		CH4N2O(aq)
			Urea

Part A

How many grams of O2 are needed to react with 15.5 g of glycine?

Express your answer with the appropriate units.

mO2 =

Part B

How many grams of urea are produced from 15.5 g of glycine?

Express your answer with the appropriate units.

murea =

Part C

How many grams of CO2 are produced from 15.5 g of glycine?

Express your answer with the appropriate units.

mCO2 =

A clock maker has 16 clock faces. Each clock requires one face and two hands.

Part A

If the clock maker has 38 hands, how many clocks can be produced?

Express your answer as an integer.

Number of clocks =

Part B

If the clock maker has only ten hands, how many clocks can be produced?

Express your answer as an integer.

Number of clocks =

How many kilojoules are released when 73.3 g of methanol reacts?
2CH3OH(l)+3O2(g)→2CO2(g)+4H2O(l)ΔH=−726kJ

Number of kilojoules =

Part B

How many kilojoules are absorbed when 347 g of Ca(OH)2 reacts?
Ca(OH)2(s)→CaO(s)+H2O(l)ΔH=+65.3kJ

Number of kilojoules =

Ethanol, C2H6O, reacts in the body via the following equation:

C2H6O(aq)+3O2(g)ethanol→2CO2(g)+3H2O(l)+327 kcal

How much heat, in kilocalories, is produced when 6.80 g of ethanol reacts with O2 gas?

Express the heat to three significant figures and include the appropriate units.

(According to the chemical equation, each mole of ethanol that reacts will produce 327 kcal. Therefore, you should first convert the mass of ethanol to its number of moles. Then, calculate the heat released when that number of moles reacts. Make certain your conversion factors are set up to allow undesired units to cancel.)

Answer 1

Part C. Molar mass of Acetylcholine = (7 * Atomic mass of C) + (1 * atomic mass of N) + (16 * atomic mass of H) + (2 * atomic mass of O)

= (7 * 12.0107) + (1 * 14.0067) + (16 * 1.00784) + (2 * 15.999) g/mol

= 146.21 g/mol

.

Part A.

Number of moles (n) = Given mass/Molar mass

Molar mass of He = 4.0026 g/mol

Therefore, For He, n = 3.47g / 4.0026g/mol = 0.867 mol

Part B.

Molar mass of SnO_{​​​​2} = 150.71 g/mol

Therefore, n. = 3.47g / 150.71g/mol = 0.0230 mol

Part C.

Molar mass of Cr(OH)₃ = 103.018 g/mol

Therefore, n = 3.47g / 103.018 g/mol = 0.0337 mol

Part D.

Molar mass of Ca_{​​​​​3}N_{​​​​2} = 148.25 g/mol

Therefore, n = 3.47g / 148.25g/mol = 0.0234 mol.

Please post other questions separately.