Answer:
Explanation:
The equation for this chemical reaction is:
2Ca + O2 -> 2CaO
So 2 moles of Ca react with 1 mole of O2 to form 2 moles of CaO.
Given 3.9 moles of Ca and 2.35 moles of O2,
Ca is the greater reactant as it will be used up.
O2 is the reactant in excess and there will be 2.35 - 3.9/2 = 0.4 moles left.
As mass of 1 mole of O2 is 32g, 0.4 moles of O2 = 0.4 * 32 = 12.8g
Moles of CaO formed = moles of Ca = 3.9
As mass of 1 mole of O2 is 56g, 3.9 moles of CaO = 3.9 * 56 = 218.4g of CaO
Most absolute dates for rocks are obtained with radiometric methods. These use radioactive minerals in rocks as geological clocks. The atoms of some chemical elements have different forms, called isotopes. These break down over time in a process scientists call radioactive decay.
hope this helps:)sorry if it doesnt
Cognitive psychology is the study of internal mental events to fully understand behavior.
<u>Explanation:</u>
Cognitive psychologist's interest in how people handle the problem. It examines the internal mental process of the people in analyzing and solving the problems or issues.
These psychologists mainly concentrate on how people react to the problems and analyze what steps they were taken to come out of the problem. There were no framed rules to be followed to identify the issues in the people.
Answer:
The bird leaves its nest and travels 20 miles per hour downwind for 3 hours. On the return trip, the bird travels 4 miles per hour slower and has 6 miles left after 7 hours.
Explanation:
20 times 3 equals 60 = 6 times 4 times 2 equals 60(6 times 8
