Answer:
Im pretty sure that it is Most early organisms were smaller in size
Explanation:
Answer:
If the hydrated salt is overheated, it causes the anhydrous salt to decompose, causing the product to be lost as gas. The reported percentage of water loss will be too high because the gap between the initial measurement and final (which will be lower due to loss of sample) measurement will widen.
Answer:
Table salt is considered to be a compound because it is made up of two elements (sodium and chloride,) while sodium itself is a raw element. That's why table salt is considered to be a compound, while sodium is not.
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Answer:
13.45 grams of NaCl will be produced
Explanation:
Given:
Mass of CuCl2 = 15 grams
Molar mass of CuCl2 = 134.5 g/mol
Mass of Na(NO3) = 20grams
Molar mass of Na(NO3) = 85 g/mol
To find:
Amount of Sodium chloride produced = ?
Solution:
<u>No of moles of CuCl2 = 15/134.5 = 0.11 moles</u>
<u>No of moles of Na(NO3) = </u><u>2</u><u>0</u><u>/</u><u>8</u><u>5</u><u> </u><u>=</u><u> </u><u>0.23 moles,</u>
<em><u>1CuCl2 + 2Na(NO3) --> 1Cu(NO3)2 + 2NaCl</u></em>
from the reaction, 1 mole of copper chloride reacts with 2 mole of NaNO3 to produce 2 moles of sodium chloride.
Hence, 0.11 mole of copper chloride will react with 0.23 mole of NaNO3 to produce 0.23 moles of sodium chloride.
Mass of 0.23 moles of NaCl = 0.23 × M.M of NaCl
<em><u>(Molar mass of NaCl = 58.5)</u></em>
Mass of 0.23 moles of NaCl = 0.23 × 58.5 = 13.45 grams
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<u>Answer:</u> The initial amount of Uranium-232 present is 11.3 grams.
<u>Explanation:</u>
All the radioactive reactions follows first order kinetics.
The equation used to calculate half life for first order kinetics:
We are given:
Putting values in above equation, we get:
Rate law expression for first order kinetics is given by the equation:
where,
k = rate constant =
t = time taken for decay process = 206.7 yrs
= initial amount of the reactant = ?
[A] = amount left after decay process = 1.40 g
Putting values in above equation, we get:
Hence, the initial amount of Uranium-232 present is 11.3 grams.