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In older airbags, sodium azide, NaN3, was used as a source of nitrogen gas to rapidly inflate the airbag. This practice was mostly discontinued due to the high toxicity of sodium azide. The reaction of interest is 2 NaN3 (s) → 2 Na (s) + 3 N2 (g)
How many grams of N2 are produced if a 35.0 g charge of NaN3 decomposes?
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- Analyse the effects of the monosubstituents -OH, -Cl, -NO2 and -CH3 on the benzene ring and predict how they direct an attacking species (such as NO2+, CH3+, Br2 and SO3) to either the 2, 3 or 4 positions on the ring during substitution. Include within this section, the names of substituted benzene compounds, indicating how the name is based upon the functional group(s) present and the different positions on the benzene ring.
A 400 mL buffer solution was prepared by reacting sodium acetate, CH3COONa, with 1.00 M acetic acid, CH3COOH, with a pH of 4.56 Calculate the mass of CH3COONa required to prepare the solution. Ka CH3COOH= 1.75 x 10-5
1. For the gaseous reaction: 2NO + 2H2 N2 + 2H2O The following data at 1100K were obtained:
Reactant Concentrations
[ NO]
5.0 x 10 -3
15.0 x 10 -3
15.0 x 10 -3
[H2]
2.0 x 10 -3
2.0 x 10 -3
4.0 x 10 -3
Rate of reaction
(mol / L. s )
2.4 x10 -5
2.2 x10 -4
4.4 x10 -4
a. Write the rate equation for the reaction.
b. What is the order of reaction?
b.1. with respect to NO ______________
b.2. with respect to H2 ______________
b.3. overall order of reaction __________
c. Calculate the rate constant for the reaction at 1100K
d. Calculate the rate in mol/L. s at 1100K at the instant when [NO] = 2.10 x 10 -3 and
[H2] = 2.50 x 10 -3
what is the percent hydrogen in ammonium oxalate (NH4)2C2O4
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Which ion has the most shells that contain electrons ?
Al 3+ , Be 2+ , N 3-
1) Many chemical processes release waste products into the atmosphere. Scientists are developing new solid catalysts to convert more efficiently these emissions into useful products, such as fuels. One example is a catalyst to convert these emissions into methanol. The catalyst is thought to work by breaking a H–H bond.
An equation for this formation of methanol is given below.
CO2(g) + 3H2(g) CH3OH(g) + H2O(g) ∆H = −49 kJ mol−1
(a) Use the enthalpy change for the reaction and data on bond entahlpies to calculate a value for the C=O bond enthalpy.
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#339914 on Dec 2023