Chemistry Answers

How do you infer that cathode rays are ubiquitous for all matters? 

draw the resonance structure of cyanate ion. out of them which one is less important as a resonance structure and why?

Caffeine, a stimulant found in coffee and some soft drinks, consists of 49.5% C, 5.15% H, and 28.9% N by mass; the rest is oxygen. Given the molar mass of caffeine is 195 g/mol, determine its molecular formula.

Vanillin, the compound responsible for the flavour vanilla, has a percentage composition of 63.2% C,

5.26% H, and 31.6% O by mass. Determine the empirical formula of vanillin.

A forensic scientist analyzes a sample for sodium arsenate, Na 3 AsO 4 (s), a source of arsenic. Calculate

the percentage composition of sodium arsenate.

he average human requires 120.0 g of glucose (C6H12O6) per day. How many grams of CO2 (in the photosynthesis reaction) are required in order to produce this amount of glucose?

The photosynthesis reaction is:     6CO2 + 6H2O -> C6H12O6 -> 6O2

In a certain reaction, element X was converted to X2-. In the reaction, X acts as

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1. The combustion of benzene is the following reaction:

C₆H₆ (l) + 7.5 O₂ (g) è 6 CO₂ (g) + 3 H₂O (g) Δ H =?

Using Hess’ Law, find the enthalpy change, Δ H, for this reaction by combining these reactions:

 6 C (graphite) + 3 H₂ (g) è C₆H₆ (l)  ΔH = + 49.0 kJ

C (graphite) + O₂ (g) è CO₂ (g)  ΔH = -394 kJ 

H₂ (g) + ½ O₂ (g) è HOH (l)  ΔH = -286 kJ

Using Bond energy reference sheet to calculate Δ H for the balanced reaction below:

C₈H₁₈ (l) + 12.5 O₂ (g) è 8 CO₂ (g) + 9 HOH (g)