Answer:
calcium phosphate has the formula Ca3(PO4)2, which has the mass of 310 grams/mol.
1 mol contains 310 grams
2.3*10^-4 moles contain 2.3*10^-4 * 310, which means 713*10^-4 grams, or 71.3 milligrams.
If you wrote the formula right and named the compound wrong, all you have to do is replace 310 with 278 and the answer will be 639.4*10^-4 grams, or 63.94 milligrams.
Answer:
no of moles = <u>volume in cm3 x concentration in</u> <u>mol/dm3 or M </u>
1000
no of moles =<u> mass</u>
molar mass
<u>mass</u>
molar mass =<u> vol x con</u>
1000
molar mass of ca(oh)2 = 74 g/mol
<u>4.9</u><u> </u><u>=</u><u> </u><u>vol</u><u> </u><u>x</u><u> </u><u>3</u><u>.</u><u>8</u><u> </u>
74. 1000
= 17.42 g
Answer:
Observation 2 is a result of silver ions changing their oxidation state.
Explanation:
Silver is reduced and forms silver precipitate. Observation 1 is a result of coppe being oxidized and forming copper nitrate
Answer:
part 1 is from the article
Explanation:
Answer:
Na + H₂O → NaOH + 1/2 H₂
Explanation:
When sodium reacts with water, it forms sodium hydroxide and molecular hydrogen. The unbalanced equation is:
Na + H₂O → NaOH + H₂
We have to balance this equation so it obeys the law of conservation of mass. We have 1 atom of Na on each side and 1 atom of O on each side, so these elements are balanced. However, we have 2 atoms of H on the left side and 3 atoms of H on the right side. The easiest way to balance the H without modifying the other elements is by making 1/2 the stoichiometric coefficient of H₂.
Na + H₂O → NaOH + 1/2 H₂
