Answer:
Here's what I get
Explanation:
The etching gel used in many dental procedures contains
- 10 % to 50 % phosphoric acid in water
- a thickening agent consisting of hydrocarbon polymers and a colloidal silica sol
- a colouring agent such as cobalt aluminate blue spinel (CoAl₂O₄) to make it visible on a tooth.
The exact molecular mass for butane (C4H10) is
12.0096*4+1.0079*10=58.1174 which is 58.1 to 3 significant figures.
Proportion of carbon in the compound
12.0096*4: 58.1174
=>
48.0384 : 58.1174
The mass of carbon in 2.50 grams of butane can be obtained by proportion, namely
Mass of carbon
= 2.50 * (48.0384/58.1174)
= 2.0664
= 2.07 g (approximated to 3 significant figures)
By weight the hydroxides are 45.9% of the weight
When atoms combine to share covalent bonds<span>, the resulting collection of atoms </span>is<span> called a molecule. We </span>can<span> therefore say that a molecule </span>is<span> the simplest unit of a </span><span>covalent compound
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