Answer:
Zinc + copper sulfate → zinc sulfate + copper
Explanation:
The zinc displaced the copper in this equation.
Mixture is obtained when several different substances are mixed together. The mixture can be separated back into its original substances and this is what differs them from compounds. From the given option, the following defines the mixtures:
<span>C. Substances that are combined but do not chemically react. </span>
B-10 = 19.9%
B-11 = 80.1%
Abundance of B10 = x
Abundance of B11= y
You know x+y = 1 because there are only the 2 isotopes.
Y= 1-x
10.01294x + 11.00931 (1-x) = 10.811
10.01294x + 11.00931 - 11.00931x = 10.811 - 0.99016x = -0.198
X = 0.200
Check:
10.01294(0.2) + 11.00931 (0.8) = 10.81
20% B10. 80% B11
Answer:
3.4 x 10²⁵ atoms Ag
Explanation:
To find the amount of silver (Ag) atoms, you need to use Avogadro's number to convert between moles and atoms. Make sure to arrange the ratio in a way that allows for the cancellation of moles. The final answer should have 2 sig figs to correlate with the number of sig figs in the given value (56 = 2 sig figs).
Avogadro's number:
6.022 x 10²³ atoms = 1 mole
56 moles Ag 6.022 x 10²³ atoms
-------------------- x ---------------------------------- = 3.4 x 10²⁵ atoms Ag
1 mole
