Answer:
Explanation:
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In this case, since we are given 4 kg of a calcium-containing sample, in order to compute the atoms there first need to compute the mass in grams:
Next, via the molar mass and the Avogadro's number, we can compute the atoms as follows:
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The correct answer is D, earthworms eat the dirt, and then release it into the soil. They turn the dirt and soil into fertilizer so to speak. Worms also leave holes in the ground, which is good for water and air for the plants roots, but that isn't an option.
Three significant figures would be 45.0 since it would end with the nine so you look at the next digit to see if you round up or it remains the same. It is greater than five so round up to zero. This makes the ones place also go up so the answer is 45.0 The zero after the decimal counts as a significant figure.
Answer:
See below
Explanation:
1 year is how many seconds ?
1 year :
365 days/ yr * 24 hours / day * 60 min/ hour * 60 seconds/ min
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see how the 'days' 'hours' 'min' all cancel and you are left with
'seconds' / 'year' ? = 31 536 000 seconds/year
Molar Mass of KCLO3
= 39 + 35.5 + 48 g
= 122.5 g .
So , percentage of Potassium ( K )
= 39 / 122.5 * 100 %
= 31.83 %
Now , percentage of Chlorine ( Cl )
= 35.5 / 122.5 * 100 %
= 28.97 %
So, finally, percentage of Oxygen ( O )
= 48 / 122.5 * 100 %
= 39.18 %
