The value of (512/986.7) + 5.44 reported to the correct number of significant fi

Question

The value of (512/986.7) + 5.44 reported to the correct number of significant figure is What is 27.8 L when expressed in cm^3? Which one of the following is the highest temperature? What are the correct atomic number, number of protons, number of neutrons and mass number for the isotope _86^222Tn Calculate the number of atoms in a 2.26 g sample of Hg Balance the equation for the combustion of hexane: C_6G_14(g) + O_2 rightarrow H_2O(g) + CO_2 Calculate the molarity of the solution 324 mg NaCl in 122.4 ml of solution (NaCl:58.5 g/mol) Name the ionic compound Li_2S What is the formula for the ionic compound, sodium hydrogen sulfite?

Explanation / Answer

Solution :-

Q1) Least number of sig fig used in the answer are 3 that is using the two decimal places because in the addition we use least number of decimal places

So the answer is option a) 5.96

Q2) 27.8 L = cm3

27.8 L * 1000 cm3 / 1 L = 27800 cm3

So the answer is option a.

Q3) 35 C +273 = 308 K

Therefore the correct answer is option a.

Q4)

Atomic number = 86 , protons = 86 , neutrons = 136 and mass number = 222

So the correct answer is option a.

Q5) (2.26 g Hg * 1 mol / 200.6 g)*(6.02*10^23 atoms / 1 mol ) = 6.78*10^21 atoms of Hg

So the correct answer is option a. that is 67.8*10^20 atoms

Q6) Balanced equation is

2C6H14 + 19 O2 ------------ > 12CO2 + 14H2O

So the correct answer is option b.

Q7) 324 mg NaCl and 122.4 ml solution

Moles of NaCl = (324 mg * 1 g / 1000 mg) / 58.5 g per mol = 0.00554 mol NaCl

Molarity = moles / volume

                = 0.00554 mol / 0.1224 L

             = 0.0453 M

So the correct answer is option a.

Q8) Li2S = Lithium sulfide

So the correct answer is option C.

Q9) Sodium hydrogen sulfite = NaHSO3

So the correct answer is option a.

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