falgunim4
13.01.2021 •
Mathematics
I need this quick please!
1. (-6y - 2) + 5(3 + 2.5y)
2. 4(2.5g - 4) + 3(1.2g - 2)
3. 2(-5y + 6) + (2y - 8)
4. 1/3(6p - 3) + 1/7(7p + 14)
Solved
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Ответ:
Step-by-step explanation:
1.13 • (y + 2) /2
2.2 • (34g - 55) /5
3. -4 • (2y - 1)
4. 3p + 1
Ответ:
x = 2.2*10^23 molecules of H2O
Explanation:
H = 1g
O = 16g
H2O = 1g*2 + 16g
H2O = 18g = 1 mol of H2O
18 g___1 mol of H2O
6.38g__ x = 0.354 mol of H2O
1 mol6.22*10^23 molecules
0.354 mol__x = 2.2*10^23 molecules of H2O