Answer: D) Electrons
Explanation:
Daltons atomic theory was electrons
Molar Mass and Avogadro's constant
Explanation:
- Molar mass is calculated by using the mass chemical compound, and the amount of substance. So, to find the molar mass of a particular element or the compound, we have to divide the mass of the given chemical compound or the chemical element( grams) by amount of substance ( moles).
- We can add the standard atomic mass (g/mole) of constituent atoms to find the molar mass of the compound.
- To convert atoms to molecules, we have to dive the number of atoms by Avogadro constant which is 6.022 x 10^23.
Answer:
18
At STP, 22.4 liters of a gas forms one mole that is 6.023×10
23
molecules.
Volume of CO
2
in 1 litre of air =
100
0.03
×1 L
∴ No. of molecules of CO
2
=
22.4
6.023×10
23
×
100
0.03
=8.066×10
18
Explanation:
I guess it's this
Answer: The correct number of significant figures in
is 35.05152.
Explanation:
Digits present in a number that helps in determining the degree of accuracy starting from the first non-zero digit is called a significant figure.
Some rules for significant figures are as follows.
- All the digits present within the non-zero digits are considered in a number.
For example, 2085 contains 4 significant digits.
- Leading zeros are not counted in a number.
For example, 0.0034 has 2 significant digits.
- We count the trailing zeros when a decimal point is present in a number.
For example, 0.02500 has 4 significant figures.
- When there is no decimal point then trailing zeros may or may not count.
For example, 19000 has 2 significant digits.
Now, the product of given digits is as follows.
![7.68 \times 4.564 = 35.05152](https://tex.z-dn.net/?f=7.68%20%5Ctimes%204.564%20%3D%2035.05152)
Thus, we can conclude that correct number of significant figures in
is 35.05152.