Any zero in a measurement is always significant True Or False

Chemistry

1 answer:

weqwewe [10]3 years ago

3 0

Answer:

False

Explanation:

A significant number is a number that is used to express the accuracy in a measurement. There are some rules that binds the identification of significant figures when reporting a scientific measurement.

All non-zero numbers are significant
Zeros in between two digits are significant.
Zeros to the right of the decimal are significant.
Leading zeros are just place holders and are not significant.
Trailing zero in a whole number with decimal is significant
Trailing zero without a decimal is not significant.

source: http://ccnmtl.columbia.edu/projects/mmt/frontiers/web/chapter_5/6665.html

We can see that not all zeros in a measurement is significant. For example, 540 has 2 significant numbers because the zero is not significant but 540.2 has 4 significant numbers.

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Nesterboy [21]

Answer:

ΔHreaction = 263.15 kJ/mol

Explanation:

The reaction is as follow:

OH + CF₂Cl₂ → HOF + CFCl₂

You need to calculate the enthalpy of reaction and for this it is necessary to know the standard enthalpies for each of the compounds. These enthalpies are as follows and can be found in your textbook or on the Internet.

ΔHreaction = ∑ΔHproducts - ∑ΔHreactants

$delta(H)_{reaction} =((1*(-97.8)+(1*(-92))-((1*39)+(1*(-491.15))=263.15kJ/mol$