Chem 121 Module 2 Exam

What is the mass of the molecular ion formed from compounds having the molecular formula, C3H6O? Calculate your answer to the nearest whole number. Enter your answer in the provided box. Your Answer:

10.4% C, 27.8% S, and 61.7% Cl Express your answer as a chemical formula.

Mass Spec:How could you distinguish the mass spectrum of 2,2-dimethylpropane from those of pentane and 2-methylbutane in a mass spectrometer?

here is my question (problem number 20) please explain to me thanks!

1.) What is the molecular formula of a compound with the empirical formula CH and a formula mass of 78.114 amu? Molecular formula: ____ ?   2.) What is the molecular formula of a compound with the empirical formula C5H7N and a formula mass of 162.236 amu? Molecular formula: ____ ?

The compound NHxNO3 contains 5.04% hydrogen by mass. What is the value of x? Enter your response as a whole number.

Do 8&9 show your work

Calculate the molecular weight for each compound. 1.) SO2 2.) Ca(NO3)2 3.) C12H22O11 4.) CFCl3 5.) CuSO4 6.) KH2PO4

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Now do your second compound, which consists of carbon, hydrogen, and one other element. Use all of the steps and find the formula of the compound. Show your work Give the % of each element first. Give symbol of your 3rd element_Br 1. Carbon 45.9007643312102% Hydrogen 320987261146497% and 3d element 50.8917197452229%

7. You are helping to clean out the lab at the end of the term and find a bottle of liquid whose label has smudged. You know from its location that the bottle contains propanol (C3H8O), ethyl acetate (C4H8O2), or both. You burn 0.300 g of the liquid and obtain 0.624 g of carbon dioxide. What compound(s) do you have in the bottle, and what is their percent by mass in the 0.300-g sample?

4 FeS2 + 11 O2     2 Fe2O3 + 8 SO2 how many moles of Fe2O3 can be obtained from 3.0 moles of O2

Match the empirical formulas with their corresponding molecular formula. CH2O  [ Choose ]      C3H4O2  C6H12O4 C10H30O5 C9H24O3 C6H12O6 C2H5O C12H22O11 C8H12O4            C3H8O  [ Choose ]      C3H4O2  C6H12O4 C10H30O5 C9H24O3 C6H12O6 C2H5O C12H22O11 C8H12O4              C2H3O  [ Choose ]      C3H4O2  C6H12O4 C10H30O5 C9H24O3 C6H12O6 C2H5O C12H22O11 C8H12O4      C3H6O2    [ Choose ]      C3H4O2  C6H12O4 C10H30O5 C9H24O3 C6H12O6 C2H5O C12H22O11 C8H12O4      C2H6O  [ Choose ]      C3H4O2  C6H12O4 C10H30O5 C9H24O3 C6H12O6 C2H5O C12H22O11 C8H12O4

A particular oral contraceptive contains 0.035 mg of ethinyl estradiol in each pill. The formula of this compound is C20H24O2. How many molecules of ethinyl estradiol are there in one pill? (give answer to 3 digits) How many carbon atoms are there in one of these pills (due to the presence of ethinyl estradiol)? (give answer to 3 digits) What mass of carbon is this? (Enter the answer in grams.)

What is the coefficient in front of the O2 when the equation below is balanced (using only whole numbers and the lowest whole number ratio)? C2H6(g) + O2 (g) → CO2(g) + H2O (g) 1 3 4 6. C 7 8 9 +/- х 100

For unknown compound B, which has the molecular formula C8H5Br3O2, calculate the theoretical amount (in mg) of silver bromide that could quantitatively be obtained from a 16.35-mg sample of compound B.

Please don't provide handwriting solution

Receptor proteins that allow us to sense heat have been isolated as well as molecules that cause us to perceive heat such as hot pepper and wasabi. If such proteins are able to detect as little as 20.0 μg of capsaicin, the chemical responsible for the burn in peppers, how many molecules of capsaicin (C18H27NO3) are required before the tongue can detect it?   _____________molecules C18H27NO3

What is the mole ratio between Cu(C2H3O2)2 x H2O and NaC7H4SO3N x H2O? the answer is: 1 mol Cu(C2H3O2)2 x H2O: 2 mol NaC7H4SO3N x H2O (This is the correct answer. can you show me how this answer was calculated)

What is the empirical formula for C4H1002? C2H5O CHO C2H40 CH20 CHO2