Answer:
a. 2.49
Explanation:
Molar mass of HCl= 36.46 g
So, no. of moles=418.8/36.46=11.48
Molality= no. of moles/mass of solvent= 11.48/4.62= 2.49
For combustion reaction we need oxygen and the results most of the time produce heat which mean first one is correct.
Well theres not a question but a covalent bond is when you share electrons.
Explanation:
Adding a neutron will not affect the charge. The atom remains neutrally charged.
Since the charge of a neutron is neutral, or 0, the charge is not affected. Protons have a positive charge, whereas electrons have a negative charge. Since there are an equal number of protons and electrons, they cancel out.
Adding a neutron also increases the mass by 1. The mass of a neutron is 1 amu. The atomic mass is calculated by protons + neutrons.
Originally, the mass is 7 (because 3+4). The mass would now be 8 (because 3+5).
To do this, you need to use the combined gas law
(P1)(V1) / T(1) = (P2) (V2) / 2
For temperature, convert to Kelvins
T1= 20.1C + 273
T1= 293.1 K
T2= 40 +273
T2= 313 K
Now sub the numbers into the formula
(1) (0.78) / 293.1 = (1.2) (V2) / 313
0.00266 = 1.2(V2) / 313
0.833 = 1.2(v2)
V2= 0.69 L is the new volume
