Answer:
Zinc, hydrochloric acid
Explanation:
A metal plus an acid equals a salt plus water
Answer:
Below in bold.
Explanation:
1 mole of an element contains 6.022* 10^23 atoms.
Ethanol has the molecular formula C2H5OH.
So we have 2 carbon atoms, 6 hydrogen atoms ans 1 oxygen atom in the molecule.
Using molar masses the mass of carbon in 36.7 g of C2H5OH
= [(2 * 12.011) / (2*12.011 + 6*1.008 + 15.999)] * 36.7
= [(2 * 12.011) /46.069] * 36.7
= 19.14 g
So the number of carbon atoms = (19.14 / 12.011) * 6.022* 10^23
= 9.596 * 10^23. (Answer).
Using molar masses the mass of hydrogen in 36.7 g of C2H5OH
= [(6 * 1.008) / (46.069)] * 36.7
= 4.818 g
So the number of hydrogen atoms = (4.818 / 1.008) * 6.022* 10^23
= 2.878 * 10^24 (Answer).
Using molar masses the mass of oxygen in 36.7 g of C2H5OH
= [(15.999) / (46.069)] * 36.7
= 12.745 g
So the number of hydrogen atoms = (12.745 / 15.999) * 6.022* 10^23
= 2.924 * 10^24 (Answer).
Answer: 1. Physical change
2. volume
3. true
Explanation: