Answer:
a) 7
b) 4
c) 1
d) 4
Explanation:
Significant figures:
All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.
Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.
Zero between the non zero digits are consider significant like 104 consist of three significant figures.
The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.
A) 34.50698 g
In this measurement there are 7 significant figures.
B) 30.00 mL
There are 4 significant figures.
c) 0.0008 g
There is only one significant figure which is 8.
d) 125.0 °C
There are 4 significant figures.
Answer:
Wavelength of the photon depends on transition from different states.
Explanation:
The wavelength of the photon that is emitted from the atom during the transition depends on the transition from different states. If the photon is emitted from n=4 state to n=3 state, the wavelength of photon is 1875 while on the other hand, if the photon is emitted from n=5 state to n=3 state, the wavelength of photon is 1282. If the photon is emitted from n=3 state to n=2 state, the wavelength of photon is 656.
Answer:
![\boxed {\boxed {\sf 5.1 \ mol \ H_2O}}](https://tex.z-dn.net/?f=%5Cboxed%20%7B%5Cboxed%20%7B%5Csf%205.1%20%5C%20mol%20%5C%20H_2O%7D%7D)
Explanation:
To convert from representative particles to moles, Avogadro's Number: 6.02*10²³, which tells us the number of particles (atoms, molecules, etc.) in 1 mole of a substance.
We can use it in a ratio.
![\frac {6.02*10^{23} \ molecules \ H_2O}{1 \ mol \ H_2O}](https://tex.z-dn.net/?f=%5Cfrac%20%7B6.02%2A10%5E%7B23%7D%20%5C%20molecules%20%5C%20H_2O%7D%7B1%20%5C%20mol%20%5C%20H_2O%7D)
Multiply by the given number of molecules.
![3.1*10^{24} \ molecules \ H_2O*\frac {6.02*10^{23} \ molecules \ H_2O}{1 \ mol \ H_2O}](https://tex.z-dn.net/?f=3.1%2A10%5E%7B24%7D%20%5C%20molecules%20%5C%20H_2O%2A%5Cfrac%20%7B6.02%2A10%5E%7B23%7D%20%5C%20molecules%20%5C%20H_2O%7D%7B1%20%5C%20mol%20%5C%20H_2O%7D)
Flip the ratio so the molecules of water cancel out.
![3.1*10^{24} \ molecules \ H_2O*\frac {1 \ mol \ H_2O}{6.02*10^{23} \ molecules \ H_2O}](https://tex.z-dn.net/?f=3.1%2A10%5E%7B24%7D%20%5C%20molecules%20%5C%20H_2O%2A%5Cfrac%20%7B1%20%5C%20mol%20%5C%20H_2O%7D%7B6.02%2A10%5E%7B23%7D%20%5C%20molecules%20%5C%20H_2O%7D)
![3.1*10^{24} *\frac {1 \ mol \ H_2O}{6.02*10^{23} }](https://tex.z-dn.net/?f=3.1%2A10%5E%7B24%7D%20%2A%5Cfrac%20%7B1%20%5C%20mol%20%5C%20H_2O%7D%7B6.02%2A10%5E%7B23%7D%20%7D)
![\frac {3.1*10^{24} \ mol \ H_2O}{6.02*10^{23} }](https://tex.z-dn.net/?f=%5Cfrac%20%7B3.1%2A10%5E%7B24%7D%20%5C%20mol%20%5C%20H_2O%7D%7B6.02%2A10%5E%7B23%7D%20%7D)
Divide.
![5.14950166113 \ mol \ H_2O](https://tex.z-dn.net/?f=5.14950166113%20%5C%20mol%20%5C%20H_2O)
The original number of molecules has 2 significant figures: 3 and 1, so our answer must have the same. For the number we calculated, that is the tenth place. The 4 in the hundredth place tells us to leave the 1.
![5.1 \ mol \ H_2O](https://tex.z-dn.net/?f=5.1%20%5C%20mol%20%5C%20H_2O)
There are about 5.1 moles of water in 3.1*10²⁴ molecules of water.
This might be wrong,but im pretty sure its 0.10 m
1 mole C₆H₁₂O₆ ------------- 6 moles oxygen
3 moles C₆H₁₂O₆ ----------- X
X = (3×6)/1
X = 18 moles