Advertisements
Advertisements
Question
Solve the following problem:
Perform the following calculation. Round off your answer to two digits.
`1/(3.40xx10^24)`
Advertisements
Solution
`1/(3.40xx10^24)`
= 0.2941 × 10–24
= 2.941 × 10–25
= 2.9 × 10–25
APPEARS IN
RELATED QUESTIONS
Explain the term Saturated solution giving examples.
Calculate the amount of carbon dioxide that could be produced when 1 mole of carbon is burnt in air.
Calculate the amount of carbon dioxide that could be produced when 2 moles of carbon are burnt in 16 g of dioxygen.
If the density of methanol is 0.793 kg L–1, what is its volume needed for making 2.5 L of its 0.25 M solution?
A sample of drinking water was found to be severely contaminated with chloroform, CHCl3, supposed to be carcinogenic in nature. The level of contamination was 15 ppm (by mass).
- Express this in percent by mass.
- Determine the molality of chloroform in the water sample.
Solve the following problem:
Write the following number in ordinary decimal form:
3.49 × 10−11
Solve the following problem:
Write the following number in ordinary decimal form:
5.16 × 104
Solve the following problem:
Write the following number in ordinary decimal form:
0.00477 × 105
Solve the following problem:
Write the following number in ordinary decimal form:
5.00858585
Solve the following problem:
Perform the following calculation. Round off your answer to two digits.
`33/(9.00xx10^-4)`
Solve the following problem:
Perform the following calculation. Round off your answer to two digits.
`((4xx10^-3)(9.9xx10^-7))/((789)(1.002xx10^-10)(0.3xx10^2))`
Perform each of the following calculations. Round off your answers to three digits.
(3.26104) (1.54106)
Perform the following calculation. Round off your answer to three digits.
(8.39 107) (4.53 109)
Solve the following problem:
Perform the following calculation. Round off your answer to three digits.
`(8.94xx10^6)/(4.35xx10^4)`
A 1.000 mL sample of acetone, a common solvent used as a paint remover, was placed in a small bottle whose mass was known to be 38.0015 g.
The following values were obtained when the acetone-filled bottle was weighed: 38.7798 g, 38.7795 g and 38.7801 g. How would you characterise the precision and accuracy of these measurements if the actual mass of the acetone was 0.7791 g?
Solve the following problem:
Your laboratory partner was given the task of measuring the length of a box (approx 5 in) as accurately as possible, using a metre stick graduated in milimeters. He supplied you with the following measurements:
12.65 cm, 12.6 cm, 12.65 cm, 12.655 cm, 126.55 mm, 12 cm.
State which of the measurements you would accept, giving the reason.
Name the process associated with the following
A drop of ink placed on the surface of water contained in a glass spreads throughout the water.
Give an example of each mixture having the following characteristics. Suggest a suitable method to separate the components of this mixture
Two immiscible liquids.
Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100g of water?
If 500 mL of a 5 M solution is diluted to 1500 mL, what will be the molarity of the solution obtained?
Which of the following terms are unitless?
(i) Molality
(ii) Molarity
(iii) Mole fraction
(iv) Mass percent
What is the difference between molality and molarity?
If 4 g of \[\ce{NaOH}\] dissolves in 36 g of \[\ce{H2O}\], calculate the mole fraction of each component in the solution. Also, determine the molarity of solution (specific gravity of solution is 1g mL–1).
250 g solution of D-glucose in water contains 10.8% of carbon by weight. The molality of the solution is nearest to ______.
(Given: Atomic weights are H, 1u; C, 12u; O, 16u)
The molality of solution containing 15.20 g of urea, (molar mass = 60) dissolved in 150 g or water is ______.
Molarity of liquid HCl will be if the density of the solution is 1.17 g/cc.
Molarity is ______.
