Hardness = 75ppm = 75 mg / L
volume = 50 mL = 0.05 L
So, applying hardness formula:
Hardness = mass / volume
so, mass = hardness x volume = 75 x 0.05 = 3.75 mg = 0.00375 g
So, moles of CaCO3 = moles of Ca2+ ions = mass / molar mass of CaCO3 = 0.00375 / 100.06 = 0.00003747751 moles
The person was travelling 100 kph (kilometers per hour). Hope this helps :)
The amount of nitrogen oxide in the air sample is determined as 7.01 ppb.
<h3>
Amount of Nitrogen oxide in the air</h3>
The amount of Nitrogen oxide (NO2) in the air in parts per billion (ppb) is calculated as follows;
12 micrograms of NO2 = 12 μg = 12 x 10⁻⁶ g
PV = nRT
V = nRT/P
Where;
- V is volume of NO2 gas
- n is number of moles of NO2 gas
- T is temperature = 40 C = 313 K
n = m/M
M = molar mass of NO2 = 46
n = 12 x 10⁻⁶/46
n = 2.73 x 10⁻⁷ mole
V = (2.73 x 10⁻⁷ x 0.082057 x 313)/(1)
V = 7.01 x 10⁻⁶ L
V = 7.01 x 10⁻⁹ m³
<h3>Amount of NO2 In parts per billion</h3>
= (Volume of NO2)/(volume of air) x 10⁹
= (7.01 x 10⁻⁹)/(1) x 10⁹
= 7.01 ppb
Thus, the amount of nitrogen oxide in the air sample is determined as 7.01 ppb.
Learn more about nitrogen oxide here: brainly.com/question/13629381
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Al(NO3)3(aq) + 3NaOH(s) --> Al(OH)3 (s) + 3NaNO3 (aq)
The precipitate here is Al(OH)3 (s), since the solid reactant is the precipitate in the aqueous solution. Usually, it is okay to assume in basic chemistry that the transition metal is going to be part of the compound that is the precipitate, especially in an acidic salt and a strong base reaction that we have here.
<span>Both are composed of two elements (that means binary).
Ionic is composed of two ions, metallic cation-positive ions, and nonmetallic anion - negative ions. For example NaCl (sodium-chloride).
Molecular compounds are composed of two nonmetallic elements. For example HCl (hydrochloric acid).</span>
