Two samples, X and Y, are labelled as carbon tetrachloride (CCl4). Upon thermal

Question

Two samples, X and Y, are labelled as carbon tetrachloride (CCl4). Upon thermal decomposition, sample X produces 32.4 g of carbon and 383.0 g of chlorine, while sample Y produces 12.3 g of carbon and 117.1 g of chlorine. Which sample(s) is/are not carbon tetrachloride? a) X b) Y c) both X and Y d) neither X nor Y e) there is not enough information to answer the question 9. 10. Nitric acid in acid rain forms when gasecous nitrogen diovide (NO) pollutant reacts with gaseous osygen (02) and liquid water (H20) to form aqueous nitric acid (HNO3). Which statement represents the stoichiometry of the balanced chemical equation? a) 402:5 H20 b) 2NO2:02 c) 3 H20 2 NO2 d) 5HNO Ho e) 4NO2 4 HNO

Explanation / Answer

9)

e

10:

e) 4 NO2 : 4 HNO3

4NO2+O2+2H2O->4HNO3

14)

V = s^3 = (5.093)3 = 132.106 cm3

d = m / V
m = d x V = 2.71*132.106= 358 g

The molar mass of CaCO3 is 100.1 g/mol.

358 g CaCO3 x (1 mol / 100.1 g) = 3.576 mol CaCO3

Each mol of CaCO3 contains 3 mol O.
3.576 mol CaCO3 x (3 mol O / 1 mol CaCO3) = 10.7 mol O

10.7 mol O x (6.02 x 10^23 atoms / 1 mol ) = 6.44354*1024

ans: D)=6.46*1024

15)

E=hf

h=planck's constant

f=frequency.

E=hf=(6.626*10-34)*(6.75*1012)

=4.47255*10-21

ans: 4) 4.47*10-21

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