Question

In: Chemistry

1. Suppose you have a 100-gram sample of each of the following compounds. Which sample contains...

1. Suppose you have a 100-gram sample of each of the following compounds. Which sample contains the largest number of moles of compound?

chromium(III) chloride

ammonia

magnesium chloride

phosphoric acid

potassium chloride

nitrogen trioxide

methane

propane

lithium chlorate

2. How many molecules of ethanol (C2H5OH) (the alcohol in alcoholic beverages) are present in 571 mL of ethanol? The density of ethanol is 0.789 g/cm3.

Express your answer numerically to three significant figures using e notation, so 1.23x1021 is entered as 1.23e21

Expert Solution

no of moles of chromium(III) chloride = W/G.M.Wt

= 100/158.36

= 0.63 moles

no of moles of NH3 = W/G.M.Wt

= 100/17 = 5.88 moles

no of moles of MgCl2 = W/G.M.Wt

= 100/95 = 1.05moles

no of moles of H3PO4 = W/G.M.Wt

= 100/98 = 1.02 moles

no of moles of KCl = W/G.M.Wt

= 100/74.5 = 1.34moles

no of moles of N2O3 = W/G.M.Wt

= 100/76 = 1.31 moles

no of moles of CH4 = W/G.M.Wt

= 100/16 = 6.25 moles >>>>>>largest no of moles

no of moles of C3H8 = W/G.M.Wt

= 100/44 = 2.27 moles

2.

mass of C2H5OH = volume * density

= 571*0.789 = 450.52 g

no of molecules = W*6.023*10^23/G.M.Wt

= 450.52*6.023*10^23/56 = 4.84*10^23 molcules

queen_honey_blossom answered 2 years ago

Give the empirical formula of each of the following compounds if a sample contains the following...

Give the empirical formula of each of the following compounds if a sample contains the following quantities of each element. (Type your answer using the format CO2 for CO2.) (a) 0.0455 mol C, 0.039 mol H, and 0.013 mol O (b) 6.44 g nitrogen and 3.67 g oxygen (c) 69.9% iron and 30.1% oxygen by mass

For each of the following determine if its: gram (+),gram(-), both or neither 1. contains teichoic...

For each of the following determine if its: gram (+),gram(-), both or neither 1. contains teichoic acids 2. contains mitochondria for energy production 3. contain 70s ribosomes 4. loses color when decolorizer applied during gram stain 5. contains peptidoglycan 6. contains a lipopolyaccharide layer 7. contains interbridges (crosslinks)that hold tetrapeptides together

Suppose you have a sample of with 100 mCi of 82Sr. When will the activity of...

Suppose you have a sample of with 100 mCi of 82Sr. When will the activity of 82Rb reach over 99% of the activity of 82Sr? min You currently have 7 submissions for this question. Only 10 submission are allowed. You can make 3 more submissions for this question. Help: Since the daugther's half-life is much smaller than the parent's half-life, the daugther reaches the parent's activity only asymptotically over several half-lives. Activity of daugther after n half-lives = (1/2)n. You...

8. Draw a flow diagram for this experiment. Indicate which phase contains each of the compounds...

8. Draw a flow diagram for this experiment. Indicate which phase contains each of the compounds in the mixture. 10. Why is it essential to carefully separate the layers during an extraction? What would happen if the layers were not separated completely? 11. You are given an impure solid that contains 70% of the desired product. After extracting 15 g of the material, you recover 6 g of the pure compound. What is the correct recovery? 12. how extraction works...

1) Which of the following compounds exhibits optical isomerism? Which of the following compounds exhibits optical...

1) Which of the following compounds exhibits optical isomerism? Which of the following compounds exhibits optical isomerism? CH3-CHBr-CH3 CH3-CH2-CHF-CH3 CH3-CH2-CH3 CH3-CH2-CH2F CH3-CH2-CBr2-CH3 2) Based on the molecular formula, determine whether each compound is an alkane, alkene, or alkyne. (Assume that the hydrocarbons are noncyclical and there is no more than one multiple bond.) Drag the appropriate items to their respective bins. "C3H6 C4H10 C4H6 C2H2" Alkane Alkene Alkyne 3) Which of the following alkane names is correct? Which of the...

Which of the following compounds is not anArrhenius acid?Which of the following compounds is...

Which of the following compounds is not an Arrhenius acid?HNO2H2SO4CH3CO2HC6HNH

Which of the following compounds are meso compounds?

For each of the following compounds, indicate the pH at which 50% of the compound will...

For each of the following compounds, indicate the pH at which 50% of the compound will be in a form that possesses a charge and at which pH more than 99% of the compound will be in a form that possesses a charge. CH3COOH (pKa = 4.76) CH3NH+3 (pKa = 10.7) Determine a pH at which pH more than 99% of CH3COOH will be in a form that possesses a charge. Express your answer using two decimal places.

you have a purse which contains six coins, each coin is either a penny , a...

you have a purse which contains six coins, each coin is either a penny , a two pence coin, a ten pence coin or a twenty pence coin. find the expected total value of all the coins in the purse.

An urn contains 100 balls that have the numbers 1 to 100 painted on them (every...

An urn contains 100 balls that have the numbers 1 to 100 painted on them (every ball has a distinct number). You keep sampling balls uniformly at random (i.e., every ball is equally likely to be picked), one at a time, and without replacement. For 1 ? i < j ? 100, let E{i,j} denote the event that the ball with the number j was taken out of the urn before the ball with the number i. Prove that the...