Answer:
15.63
Explanation:
250g O2 x 1 mol O2 x 2mol HgO / 32 g O2 x 1 mol O2
Explanation:
Molarity = mol/L or g/L
Data:
Mass>80.0g
Mr of CaCl2>111.1g/mol
V>500mL
Convert mL to Litres;. mole=g/Mr
1L=1000mL. =80g/111.1g/mol
x=500mL. =0.720072007mol
x=0.5L
Molarity= mole/volume
=0.720072007mol/0.5L
=1.440144014mol/L
=1.4401mol/L
Hope this helps. Depending on the question you can also find it in g/L but mol/L is safer.
Answer: The bottle has a total mass of 13000 mg of insulin.
Explanation:
We are given:
Concentration of insulin = 40 mg/mL
and we need to fins the mass of insulin in 325 mL of bottle.
From above, we know that:
1 mL contains 40 mili-grams of insulin.
So, 325 mL will contain = = 13000 mili-grams of insulin.
Hence, the bottle has a total mass of 13000 mg of insulin.
They have the same number of "protons" but a different number of "neutrons" therefore their "atomic number" weight(or mass) is different