What is a group of elements that form salts called
2 answers:
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Answer:
Explanation:
To convert from grams to atoms:
- Convert grams to moles
- Convert moles to grams
1. <u>Convert grams to moles</u>
First, find the molar mass of cobalt using the Periodic Table of Elements.
- Cobalt (Co): 58.93319 g/mol
Next, use this mass as a ratio or fraction.
Multiply the mass of the given sample (345 grams) by this ratio.
Flip the fraction so the grams of Cobalt will cancel each other out when multiplying.
2. <u>Convert moles to atoms</u>
Use Avogadro's Number, which tells us the number of units (in this case atoms) in 1 mole.
Use this number as a ratio or fraction.
Multiply this ratio by the number of moles we found.
The moles of Cobalt will cancel.
3.<u>Round</u>
The original measurement of 345 has 3 significant figures (3, 4, and 5). We must round to 3 sig figs, which is the hundredth place for this measurement.
The 5 in the thousandth place tells us to round the 2 to a 3.
There are about <u>3.53*10²⁴ atoms of cobalt in 345 grams.</u>
The mortar and pestle is most commonly used in chemical laboratories or in the kitchen. Its key function is to grind the material into smaller pieces, usually into its powdered form. It looks like that shown in the picture. The mortar is the bowl in which the material to be pounded is placed, and the pestle does the pounding.
Now, when you ask if it can only pound one at a time, my honest answer is, it depends. Depending on the size of your mortar, you could grind materials two or three at a time. But if you are concerned with contamination, then you do it one at a time, especially if you don't want them to get mixed up.
Now, when you ask if it can only pound one at a time, my honest answer is, it depends. Depending on the size of your mortar, you could grind materials two or three at a time. But if you are concerned with contamination, then you do it one at a time, especially if you don't want them to get mixed up.