<h3><u>Answer:-</u></h3>
3. <u>Proton</u> is the subatomic particle which accounts for most of an atom's mass.
4. <u>Electrons</u> are the subatomic particle which accounts for most of atoms volume.
Answer:
4.79x10¹³s⁻¹
Explanation:
For a first order reaction, the graph of ln k against 1/K follows Arrhenius equation:
lnK = ln A - Ea/RT
<em>Where A is pre-exponential factor, Ea is activation energy, R gas constant and T is absolute temperature</em>
<em />
If you graph ln k = y and 1/T = x:
y = lnA - Ea/R x
<em>Where the slope = -Ea/R</em>
<em>And the intercept = lnA</em>
<em />
To solve the pre-exponential factor:
31.5 = lnA
e^31.5 =
<h3>4.79x10¹³s⁻¹</h3>
s⁻¹ because the reaction is first order.
Molar mass:
O2 = 16 x 2 = 32.0 g/mol Mg = 24 g/mol
<span>2 Mg(s) + O2(g) --->2 MgO(s)
</span>
2 x 24.0 g Mg -------------> 32 g O2
5.00 g Mg -----------------> ( mass of O2)
mass of O2 = 5.00 x 32 / 2 x 24.0
mass of O2 = 160 / 48
= 3.33 g of O2
hope this helps!
NaOH +HCl ---> NaCl +H2O
n (mol HCl) = n (mol NaOH)
M- molarity
V - volume
M(HCl)V(HCl) = M(NaOH)V(NaOH)
M(HCl)= M(NaOH)V(NaOH)/V(HCl)
M(HCl)= 10⁻³*25.3 ml/5.25 ml=<span>4.82 × 10⁻³ M molarity HCl</span>