Calculate (give your answer with correct number of significant figures): a. 5.67

Question

Calculate (give your answer with correct number of significant figures): a. 5.678 times 2.0 times 3.24 = _________ b. 12.456 - 2.3 = _________ c. 67.42 + 0.101 = _________ d. 9.234/2.6 = _________ Concentration of H_3 O^+ in solution is 5.0 middot 10^-12 M. What is concentration of OH^- ions solution? What is pH the solution. Is this solution neutral, basic or acidic? Buffer solution has pH 4.00. Small amount of strong bases is added to it. Will solution increase, decrease, become neutral or show no change? Please, answer. Draw the condensed structural formulas for each the following: a. 2, 2 - dimethylpropane

Explanation / Answer

a)

5.678 has 4 significant figure

2.0 has 2 significant figure

3.24 has 3 significant figure

So, the product will have 2 significant figure

5.678*2.0*3.24 = 37

Answer: 37

b)

12.456 has 3 digits after decimals

2.3 has 1digits after decimals

SO,

result will have 1digits after decimals

12.456 -2.3 = 10.2

c)

67.42 has 2 digits after decimals

0.101 has 3 digits after decimals

SO,

result will have 2 digits after decimals

67.42+0.101 = 67.52

d)

9.234 has 4 significant figure

2.6 has 2 significant figure

So, the result will have 2 significant figure

9.234/2.6 = 3.6

I am allowed to answer only 1 question at a time

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