Question

please tell me the answer​

Answer 1

Using

$\huge{Moles=\frac{Mass given}{Molecular Mass}}$

1. $moles \: = \frac{50}{23} = 2.17moles$
2. $moles \: = \frac{100}{40} = 2.5$
3. $moles \: = \frac{200}{40} = 5$
5. $moles = \frac{100}{74 } = 1.35$
6. $we \: know \: that \: 1 \: mole = 6.023 \times 10 {}^{23 } molecules$
7. $moles \: = \frac{100}{84 } = 1.2$
8. $moles \: = \frac{50}{58.45} = 0.85$
9. $moles \: = \frac{100}{106} = 0.95$
10. $moles = \frac{50}{28} 1.78$

HOPE IT HELPS

4th was not visible sorry for that