Answer: Significant figures in a measurement are all measured digits, and one estimated digit
Significant figures communicate the level of precision in measurements Significant figures are an indicator of the certainty in measurements.
Explanation:
Significant figures : The figures in a number which express the value or the magnitude of a quantity to a specific degree of accuracy or precision is known as significant digits.
The significant figures of a measured quantity are defined as all the digits known with certainty and the first uncertain or estimated digit.
Rules for significant figures:
1. Digits from 1 to 9 are always significant and have infinite number of significant figures.
2. All non-zero numbers are always significant.
3. All zero’s between integers are always significant.
4. All zero’s preceding the first integers are never significant.
5. All zero’s after the decimal point are always significant.
Answer:
Number of mole = 5moles
Explanation:
To find the number of mole of methane,we will use the formula
n = m/ Mm
n - moles
m - mass
Mm - molar mass
Since m - 80g
Let's calculate the molecular weight of CH4
C - 12
H - 1
Mw = 12 + 1 * 4
= 12 + 4
= 16g/mol
n = 80g/16g/mol
n = 5moles
I don’t see any pictures of answer choices! Ah i’m sorry! :)
Step by step explanation:
The answer is (4) neutron and proton. The electron has very little mass and the neutron and proton have approximately the same mass. The positron has approximately the same mass as electron. The beta particle is electron. And the alpha particle is the nucleus of He which is about the same mass as 4 protons.
