38) What is the empirical formula for ethyl fluoride if the compound contains 49

Question

38)

What is the empirical formula for ethyl fluoride if the compound contains 49.97% carbon, 10.51% hydrogen, and 39.52% fluorine by mass?

Select one:

A. C4H10F4

B. C4H10F2

C. C25F2

D. C2H5F

39)

How many chloride ions are in 1.50 mol of aluminum chloride?

Select one:

A. 2.71 × 1024 chloride ions

B. 4.50 chloride ions

C. 9.03 × 1023 chloride ions

D. 3.00 chloride ions

40)

Combustion analysis of a 0.675 g sample of an unknown compound that contains only carbon, hydrogen, and oxygen gives 0.627 g of CO2 and 1.534 g of H2O. The molecular mass of the unknown is

Select one:

A. C6H12O2.

B. C3H6O.

C. C9H18O3.

D. unable to be determined from this data.

41)

How many milliliters of 0.550 M hydriodic acid are needed to react with 25.00 mL of 0.217 M CsOH?
HI(aq) + CsOH(aq) CsI(aq) + H2O(l)

Select one:

A. 0.0158 mL

B. 9.86 mL

C. 63.4 mL

D. 0.101 mL

42)

How many moles of BCl3 are needed to produce 25.0 g of HCl(aq) in the following reaction?
BCl3(g) + 3 H2O(l) 3 HCl(aq) + B(OH)3(aq)

Select one:

A. 0.229 mol

B. 2.06 mol

C. 0.686 mol

D. 4.38 mol

43)

Combustion analysis of an unknown compound containing only carbon and hydrogen produced 4.554 g of CO2 and 2.322 g of H2O. What is the empirical formula of the compound?

Select one:

A. C5H2

B. CH2

C. C2H5

D. C4H10

44)

What is the mass of 8.50 × 1022 molecules of NH3?

Select one:

A. 2.40 g

B. 0.00830 g

C. 0.417 g

D. 120 g

45)

When methane, CH4, undergoes combustion with oxygen, the usual products are carbon dioxide and water. Carbon monoxide is formed when the limiting reactant is

Select one:

A. carbon dioxide.

B. water.

C. oxygen.

D. methane.

46)

How many anions are there in 2.50 g of MgBr2?

Select one:

A. 8.87 × 1025 anions

B. 8.18 × 1021 anions

C. 4.43 × 1025 anions

D. 1.64 × 1022 anions

47)

Given the chemical equation: N2 + 3 H2 2 NH3. On a microscopic level, what do the coefficients mean?

Select one:

A. 1 atom of nitrogen reacts with 3 atoms of hydrogen to give 2 atoms of ammonia.

B. 1 mole of nitrogen reacts with 3 moles of hydrogen to give 2 moles of ammonia.

C. 1 molecule of nitrogen reacts with 3 molecules of hydrogen to give 2 molecules of ammonia.

D. 28 g of nitrogen reacts with 6 grams of hydrogen to give 34 grams of ammonia.

48)

Balance the chemical equation given below, and calculate the volume of nitrogen monoxide gas produced when 8.00 g of ammonia is reacted with 12.0 g of oxygen at 25°C? The density of nitrogen monoxide at 25°C is 1.23 g/L.
___ NH3(g) + ___ O2(g) ___ NO(g) + ___ H2O(l)

Select one:

A. 7.32 L

B. 16.5 L

C. 11.2 L

D. 18.8 L

Explanation / Answer

38)

What is the empirical formula for ethyl fluoride if the compound contains 49.97% carbon, 10.51% hydrogen, and 39.52% fluorine by mass?

Assume a basis o 100 grams

therefore, 50 g of C, 10g of H, 40 g of F

MW of C = 12 ---> 50/12 = 4.16

MW of H = 1 --> 10/1 = 10

MW of F = 19 --> 40/19 = 2.1

Therefore, ratio is C4H10F2

which can be simplified to C2H5F

Select one:

A. C4H10F4

B. C4H10F2

C. C25F2

D. C2H5F

NOTE: conside rposting all other questions in a single set of Q&A. Wea re not allowed to answer to multiple question in a single set of Q&A

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