Answer:
A). CH4.
Explanation:
Ar and Mg are elements.
LiBr and NaI are ionic compounds.
CH4 has 4 covalent bonds between the carbon and hydrogen atoms.
Take a hypothetical sample of exactly 100 grams of the solution.
(16g urea) / (60.06 g urea/mol) = 0.2664 mol urea
((100 g total) - (16g urea)) = 84.0 g H2O = 0.0840 kg H2O
(0.2664 mol) /0.0840 (kg) = 3.17143mol/kg = 3.18m urea
Answer:
Accuracy decreases
Explanation:
All meaurements have an uncertainty (That is, the error of the measurement). The uncertainty of graduated cylinders is higher than uncertainty of pipets.
The accuracy is how close is the measurement to the real value.
If you use graduated cylinders rather than pipets, <em>accuracy decreases </em>because you will have more uncertainty in the measurements putting of the real value and the real value.
Answer:
have you finished this yet
Explanation: