Answer:
The mass number of an atom, which is also called the atomic mass number, is the total number of protons and neutrons in an atom,
Explanation:
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Answer: Keith and Aaron only
Explanation:
Since the school record for the 100-meter dash is 18 seconds, while
Juan did 19 seconds;
Hans did 16 seconds;
Keith did 17 seconds; and
Aaron did ILELE (unknown value)
Based on this illustration, only Keith and Aaron finished the 100-meter race at a lesser time than the school record.
Thus, Keith and Aaron only are the students that have broken the school record.
Answer:
30.34g (corrected to 4 significant figures).
Explanation:
Take the atomic mass of C=12.0, H=1.0, O=16.0.
no. of moles = mass / molar mass
So, no. of moles of butane reacted = 10 / (12x4 + 1x10)
= 0.172414 mol
Since O2 is in excess and butane is the limiting reagent, the no. of moles of carbon dioxide produced depends on the no. of moles of butane reacted.
From the equation, the mole ratio of butane:Carbon dioxide = 2: 8 = 1: 4,
meaning 1 mole of butane gives 4 moles of CO2.
Using this ratio,
we can deduce that the no. of moles of CO2 produced = 0.172414 x 4
=0.689655 mol
As mass = no. of moles x molar mass
mass of CO2 produced = 0.689655 x (12.0+16.0x2)
=30.34g (corrected to 4 significant figures).
Answer:
4.1 * 10^5
Explanation:
410,000
As we can see, there are 4 zero and 1 number 1 after the first number so the number when written in scientific notation would be:
4.1 * 10^5
Hope this can help you :3