What is the mass percent of C in C2H6?
A. |
79.85 |
|
B. |
None of these choices is correct |
|
C. |
92.24 |
|
D. |
39.93 |
|
E. |
20.15 |
What is the mass percent of C in C2H6? A. 79.85 B. None of these choices...
Determine the empirical formula of a compound containing 79.85% carbon, and 20.15% hydrogen. A. None of these choices is correct B. (CH2)n C. (CH3)n D. (CH4)n E. (CH)n
3. A hydrocarbon that contains 79.85% C and 20.15% H. The molar mass of the hydrocarbon is 30.08 g/mol. a. Determine the molecular formula of the hydrocarbon. b. Write the chemical equation for the combustion of this hydrocarbon. C. What is the theoretical yield of CO2 from this combustion reaction if 2.5 grams of the hydrocarbon reacts with 2.5 grams of O2?
1. What is the formula mass of Al(NO2)3? A. 72.99 amu B. 165.01 amu C. 56.99 amu D. None of these choices is correct E. 120.99 amu
1. What mass of CO2 is produced from burning 6.00 g C2H6 in excess oxygen? A. 11.7 g B. 8.80 g C. 17.6 g D. 4.40 g E. none of these 2. Consider the following unbalanced reaction: Al (s) + Br2 (l) --> Al2Br6 (s) How many moles of Br2 (l) are required to react with 10 moles of Al? A. 10 moles B. 60 moles C. 20 moles D. 30 moles E. 15 moles
a gaseous hydrogen and carbon containing compound is decomposed and found to contain 79.85% C and 20.15% H by mass A.) What is the empirical formula of the compound? I already found the the empirical formula, its CH3 B.) at 43.0 °C and 0.984 atm, the gas occupies a volume of 1.8 L and has a mass of 2.04g. what is the molecular formula of the compound?
eda 17, what is the pOH ofa 0.0077 M KOH solution? A. 9.13 B. None of these choices is correct. ROK C. 11.89 D. 4.87 18. What is the [O1I] for a solution at 25°C that has [Hs0]- 1.22 x 103 M? A. 8.20E-5 M B. 8.20E-12 M C. 1.22E-11 M D. None of these choices is correct. E. 1.22E-17 M 19. What is the pH of a 0.30 M solution of NHC1? [Kb(NHs) 1.8 x 10-1 A. 4.63 B....
1. What is the mass of 0.78 × 1022 Mg-atoms in grams? A. 2.36 × 10-5 B. 7.1 C. 0.315 D. 5.35 × 10-4 E. None of these choices is correct 2. Which of the following is a molecular compound? A. Sodium nitride B. Calcium oxide C. Carbon dioxide D. None of these choices is correct E. Barium hydroxide
Which of the following reactions can be used to calculate the DHof of C2H6? a)2 C (graphite) + 6 H (g) ---> C2H6 (g) b)2 C (graphite) + 3 H2 (g) ---> C2H6 (g) c)None of the above reactions can be used. d)C2 (s) + 3 H2 (g) ---> C2H6 (g) e)C (graphite) + 3/2 H2 (g) ---> 1/2 C2H6 (g)
What is (are) the possible product(s)? a. A b. B. c. C d. A and B e. A, B, and C What is the product? a. A b. B c. C d. D c. None of the choices are correct What is (are) the possible product(s) of the following reaction? a. A b. B c. C d. A and B e. B and C
The electric field intensity E is defined as A) None of the other 3 choices. B) The amount of force that acts on a unit charge. C) The amount of flux emerging from a unit charge. D) The amount of energy that is required to move a unit charge. The "Divergence" of a vector is A) A scalar. B) A vector. C) None of the other 3 choices. D) A vector plus a scalar. The "Curl" of a vector is