Answer: Amu is an atomic mass unit.
B.To transmit signals first it got to reach the antennas thingys to send the signal thats how we get our data and wifi on our phones
Answer:
84.11 g/mol
Explanation:
A metal from group 2A will form the cation M²⁺, and the ion carbonate is CO₃²⁻, so the metal carbonate must be: MCO₃, and the reaction:
MCO₃(s) → MO(s) + CO₂(g)
For the stoichiometry of the reaction, 1 mol of MCO₃(s) will produce 1 mol of CO₂. Using the ideal gas law, it's possible to calculate the number of moles of CO₂:
PV = nRT , where P is the pressure, V is the volume(0.285 L), R is the gas constant (62.36 mmHg*L/mol*K), n is the number of moles, and T is the temperature (25 + 273 = 298 K).
69.8*0.285 = n*62.36*298
18583.28n = 19.893
n = 0.00107 mol
So, the number of moles of the metal carbonate is 0.00107. The molar mass is the mass divided by the number of moles:
0.0900/0.00107 = 84.11 g/mol
Answer:
less HCL acid is required to neutralize a weaker solution of base (sodium bicarbonate).
Explanation:
Balanced chemical reaction: 3O₂+ 4Cr → 2Cr₂O₃.
a) Oxidation half-reaction: Cr → Cr⁺³ + 3e⁻ /×4; 4Cr → 4Cr⁺³ + 12e⁻.
b) Reduction half-reaction: 4e⁻ + O₂ → 2O⁻² /×3; 12e⁻ + 3O₂ → 6O⁻².
Oxidation is increase of oxidation number (chromium from zero to +3) and reduction is decrease of oxidation number (oxygen from zero to -2).
