<u><em>Answer:</em></u>
<u><em>49.98</em></u>
<u><em>Explanation:49.98 should be the correct answer but if you start with 49.98 g H2O2 and decompose all of it you do not get 34.00 g H2O and 15.98 g O2. </em></u>
Answer:
Hg
Explanation:
We are given information about the unknown element, and using each characteristic, we can narrow down the possible elements until we have just one possibility left.
Conducts electricity: This means that the element has to be a metal, or a semi-metal, because non-metals cannot conduct electricity.
Forming chloride and oxide ions: When it is seen that it forms chloride and oxide ions in the form of XCl₂ and XO, it can be seen that this element has an ionic charge of +2. This narrows it down to the elements in <u>Group 2.</u>
Liquid at room temperature: This is tricky, because we realize that there are no elements in group 2 that are liquid at room temperature. So hence we can look at groups 3 to 12, and see if there are any liquid metals with an ionic charge of +2.
Taking all this information into account, we can see that the only element it can be is mercury (Hg).
Chemical leavening agents are baking soda and a mixture of baking powder. It reacts immediately when added to liquids because it causes two separate reaction to occur in the dough. The first reaction happens when the baking powder is mixed with liquids; it causes carbon dioxide to be produced. The second reaction occurs when the heat mixed during the baking process; causes further expansions.
<span>Molecules condense when the temperature decreases :)</span>
Hello!
We know that by the Law of Avogrado, for each mole of substance we have 6.02 * 10²³ atoms, if:
The molar mass of water (H2O)
H = 2 * (1u) = 2u
O = 1 * (16u) = 16u
---------------------------
The molar mass of H2O = 2 + 16 = 18 g / mol
If:
1 mol we have 6.02 * 10²³ atoms
1 mole of H2O we have 18 g
Then we have:
18 g ------------- 6.02 * 10²³ atoms
5 g -------------- x
I Hope this helps, greetings ... DexteR! =)
