Question

How many significant figures are present in 0.32gm
​

Answer 1

Answer:

A container contains

of

and the same volume of an unknown gas at the same

and

weighing

. If the gas obtain only

and

in the ratio

its molecular formula will be

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Text Solution

Answer :

B

Solution :

According to Avogadro's law equal volumes contain equal number of moles. Thus, moles of unknown gas are equal to moles of

i.e.,

. The molar mass of gas is

Answer 2

Answer:

2

Explanation:

Given: 0.32 gram

To find: Number of significant figures.

Significant figures are the number of digits in a value, often a measurement, that contribute to the degree of precision of the value.

Use the following 3 rules to determine the number of significant digits in a number:

1. Nonzero digits are always significant
2. The zeroes that appear between two significant figures are significant.
3. The trailing zero or trailing zeros in the decimal are significant

Now, in the given number 0.32 , there are two non-zero digits 3 and 2 , thus both are significant.

As only the trailing zeroes and any zero between two significant figures are significant, thus the zero before the decimal point is not significant.

Hence, the number of significant figures in 0.32 gm is 2.

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