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dsp73
4 years ago
14

Just help just help just help just help look at pic​

Chemistry
1 answer:
Triss [41]4 years ago
4 0

Answer:

The combined number of protons and neutrons.

Explanation:

The combined number of protons and neutrons is actually the Mass Number of one Isotope of Sodium ( 11 protons + 12 neutrons).  It is the most abundant isotope - that is why the  value is 22.99 which is more accurately call the  Relative Atomic Mass of sodium.

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The second-order rate constant for the following gas-phase reaction is 0.041 1/MLaTeX: \cdotâs. We start with 0.438 mol C2F4 in
pantera1 [17]

Answer:

134.8 seconds is the half-life (in seconds) of the reaction for the initial C_2F_4 concentration

Explanation:

Half life for second order kinetics is given by:

t_{\frac{1}{2}=\frac{1}{k\times a_0}

Integrated rate law for second order kinetics is given by:

\frac{1}{a}=kt+\frac{1}{a_0}

t_{\frac{1}{2} = half life

k = rate constant

a_0 = initial concentration

a = Final concentration of reactant after time t

We have :

C_2F_4 \longrightarrow \frac{1}{2} C_4F_8

Initial concentration of C_2F_4=[a_o]=\frac{0.438 mol}{2.42 L}=0.1810 mol/L

Rate constant = k = 0.041 M^{-1} s^{-1}

t_{\frac{1}{2}=\frac{1}{k\times a_0}

=\frac{1}{0.041 M^{-1} s^{-1}\times 0.1810 mol/L}

t_{1/2}=134.8 s

134.8 seconds is the half-life (in seconds) of the reaction for the initial C_2F_4 concentration

3 0
3 years ago
What is the gram atomic mass of sodium?
Rom4ik [11]
3.8175407 × 10^-23 g ± 3.3210778 × 10^-32 g
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How does chemistry affect the food you eat
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4 years ago
An engineer turns the temperature of a gas down, holding the volume constant at 1,250 L. Initially, the temperature of the gas w
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Answer:

625=275

240=x

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Explanation:

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5 0
3 years ago
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Ann [662]

Answer:

       

Explanation:

       

4 0
2 years ago
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