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ratelena [41]
3 years ago
14

How many significant digits does the number 700 have?

Chemistry
2 answers:
OLga [1]3 years ago
5 0

Answer: 700 has one significant figure which is 7.

Explanation: These are some rules for significant figures

•All non-zero digits are significant: 1,2,3,4,5,6,7,8,9

•Zero between non-zero digits are significant: They are three significant figures in 203.

•Leading zeros are not significant: There are two significant figures in 0.56.

•Trailing zero to the right of decimal are significant. There are four significant figures in 62.00

•Trailing zeros in a whole number with the decimal shown are significant: This makes "700." three significant figures.

•Trailing zeros in a whole number with no decimal shown are not significant: This makes 700 one significant figure.

Snezhnost [94]3 years ago
4 0

Answer: In the number 700 there is only one significant figure.

Explanation:

How do I know this? Well, ya see, 7 is a nonzero digit. So, since it is a non zero digit, the significant digit of 700 is 7. To determine what numbers are significant and which aren't, use the following rules:

The zero to the left of the decimal value less than 1 is not significant.

All trailing zeros that are placeholders are not significant.

Zeros between non zero numbers are significant.

All non zero numbers are significant.

If a number has more numbers than the desired numbers of significant digits, the number is rounded. For example, 432,500 is 433,000 to 3 significant digits.

Zeros at the end of numbers which are not significant but are not removed, as removing would affect the value of the number. In the above example, cannot remove 000 in 433,000 unless changing the number into scientific notation.

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MakcuM [25]

Answer:

ΔH°rxn = - 433.1 KJ/mol

Explanation:

  • CH4(g) + 4Cl2(g) → CCl4(g) + 4HCl(g)

⇒ ΔH°rxn = 4ΔH°HCl(g) + ΔH°CCl4(g) - 4ΔH°Cl2(g) - ΔH°CH4(g)

∴ ΔH°Cl2(g) = 0 KJ/mol.....pure element in its reference state

∴ ΔH°CCl4(g) = - 138.7 KJ/mol

∴ ΔH°HCl(g) = - 92.3 KJ/mol

∴ ΔH°CH4(g) = - 74.8 KJ/mol

⇒ ΔH°rxn = 4(- 92.3 KJ/mol) + (- 138.7 KJ/mol) - 4(0 KJ/mol) - (- 74.8 KJ/mol)

⇒  ΔH°rxn = - 369.2 KJ/mol - 138.7 KJ/mol - 0 KJ/mol + 74.8 KJ/mol

⇒ ΔH°rxn = - 433.1 KJ/mol

4 0
3 years ago
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You have a solution of calcium chloride dissolved in water. You add some more solid to the solution and stir, and the solid diss
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Answer:

It changed from unsaturated to saturated solution

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During chemical weathering, forsterite is dissolved by the carbonic acid in rainwater. The weathering reaction is as follows:
Semenov [28]

Answer:

Keqq = 310

Note: Some parts of the question were missing. The missing values are used in the explanation below.

Explanation:

<em>Given values: ΔH° = -178.8 kJ/mol = -178800 J/mol; T = 25°C = 298.15 K; ΔS° = -552 J/mol.K; R = 8.3145 J/mol.K</em>

Using the formula ΔG° = -RT㏑Keq

㏑Keq = ΔG°/(-RT)

where ΔG° = ΔH° - TΔS°

㏑Keq = ΔH° - TΔS°/(-RT)

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㏑Keq = -14221.2/-2478.968175

㏑Keq = 5.73674166

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3 years ago
An environmental study of a certain metropolitan region indicates that given population x (in thousands), the average daily leve
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Answer:

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Explanation:

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c(x) = 0.5x + 2 parts per million..[1]

The population of the region after t years is modeled by the formula :

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Solving for x , we get ;

x = 11.6

Using [2] to calculate value of t.:

x(t) = 11.6

11.6 = 10 + 0.1t^2

Solving for 't' we get ;

t = 4 years

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