Answer:
4.3 x 10⁶ kJ are released
Explanation:
From the balanced chemical equation we know that when 2 moles of hydrogen peroxide decompose, 191 kJ of heat are released. So what we need to calculate is the number of moles the 765 kg of H2O2 represent and calculate the heat released.
Molar Mass H2O2 = 34.01 g/mol
Mass H2O2 = 765 Kg x 1000 g/Kg = 765000 g
moles H2O2 = 1 Mol / 34.01 g x 765000 grams = 22.5 Mol
(-196.1 kJ/ 2 mol H2O2 ) x 22.5 mol H2O2 = -4.3 x 10⁶ kJ
The alkali metals make up Group 1 of the periodic table. This family consists of the elements lithium, sodium, potassium, rubidium, cesium, and francium (Li, Na, K, Rb, Cs, and Fr, respectively). Group one elements share common characteristics. They are all soft, silver metals. Due to their low ionization energy, these metals have low melting points and are highly reactive. The reactivity of this family increases as you move down the table. Alkali metals are noted for how vigorously they react with water. Due to this, they are often stored in mineral oil and are not found in their elemental forms in nature. These characteristics can be explained by examining the electronic structure of each element in this group. Alkali metals have one valence electron. They readily give up this electron to assume the noble gas configuration as a cation. This makes the elements in this group highly reactive.hope this helps you ok.
Answer:
Which of the following substances are ionic?
Check all that apply.
AlCl3
MgI2
C2H5OH
NH3
Explanation:
An ionic substance is formed between a positively charged cation and a negatively charged anion.
Ionic substances are generally formed from metal and nonmetal atoms with the metal atoms forming the cations and the nonmetal atoms forming the anions.
Among the given substances,
MgI2 is an ionic substance.
Since Mg is the metal atom. It forms a cation.
I is a nonmetal atom. It forms anion.
Hence,
MgI2 is an ionic substance.
Though AlCl3 looks like an ionic substance it is a covalent compound.
This is due to the high polarizability of 
ion.
The remaining two compounds do not contain any metal atoms.
So, ethanol and NH3 are not ionic compounds.
Answer:
MgI2
It will take
7.5 s for the car to stop.
One of the acceleration formulas is
+at, where
is the final velocity,
is the initial velocity,
a is the acceleration, and
t is the time.
0 = 30.0 m·s⁻¹ + (-4.0 m·s⁻²)t
4.0 s⁻¹ t = 30.0
t =
= 7.5 s
The partial pressure<span> of </span>water<span> in the mixture, P</span>water<span>, is the equilibrium </span>vapour pressure<span> of </span>water<span> at the temperature specified. At 298 K, from the data at the beginning of the questions section, P</span>water<span> = 3.17 kPa. Using the Ideal Gas Equation, the number of moles of N</span>2<span> can be calculated.</span>
