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0.8 x 10 23
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What is the pH of an actetic acid solution when 30 ml 15M NaOH have been added to 50 ml HOAc?
To determine the pH of the solution after adding 30 ml of 15M NaOH to 50 ml of HOAc, we need to calculate the moles of each component to find the excess OH- ions. Then, we can determine the resulting concentration of hydroxide ions and use the Kb value of HOAc to calculate the OH- concentration, which can be used to calculate pOH and finally pH using the relation pH = 14 - pOH.
How many moles of silver atoms are in 1.8 x 10 25 atoms of silver?
To calculate the number of moles, you divide the number of atoms by Avogadro's number (6.022 x 10^23). So for 1.8 x 10^25 atoms of silver, the number of moles would be 30 moles.
What is the number of moles of solute in 30 ml of 0.2M hydrochloric acid solution?
To find the number of moles of solute in the solution, you first need to calculate the amount of solute in moles using the formula: moles = molarity x volume (in liters). Since the volume given is in milliliters, you need to convert it to liters by dividing by 1000. Then, you can calculate the moles of hydrochloric acid in 30 ml of 0.2M solution.
What is the atomic number of zinc-67?
The atomic number of an element is the number of protons in its nucleus. Zinc has an atomic number of 30, so all isotopes of zinc will have 30 protons. Therefore, the atomic number of zinc-67 is also 30.
Neutral atom with 30 protons and 34 neutrons what is atomic number?
The atomic number is 30 because it is determined by the number of protons in the nucleus of an atom. Since the atom is neutral, it will also have 30 electrons surrounding the nucleus to balance the positive charge of the protons.
How do you work out 30 percent of a number?
To calculate 30 percent of a number, multiply the number by 0.3. For example, 30 percent of 80 is equal to 80 x 0.3 = 24.
How many is 30 percent?
Thirty percent (30%) of a number is calculated by multiplying that number by 0.30. For example, if you want to find 30% of 100, you would calculate 100 × 0.30, which equals 30. Therefore, 30% represents 30 parts out of every 100.
How do you find 30 percent of a number?
To find 30 percent of a number, multiply that number by 0.30 For mental arithmetic it is sometimes easier to divide the number by 100 (to calculate 1%) then multiplying by 30 (for 30%). Simply put move the decimal point of the required percentage two spaces to the right ( to get 1%) and multiply the amount of 1% by the percent wanted. For example: 43 % of 3300 = 0.43 x 3300 = 1419 30 % of 450 = 0.3 x 450 = 135
What is the pH of an actetic acid solution when 30 ml 15M NaOH have been added to 50 ml HOAc?
To determine the pH of the solution after adding 30 ml of 15M NaOH to 50 ml of HOAc, we need to calculate the moles of each component to find the excess OH- ions. Then, we can determine the resulting concentration of hydroxide ions and use the Kb value of HOAc to calculate the OH- concentration, which can be used to calculate pOH and finally pH using the relation pH = 14 - pOH.
During a 30-year period a severe drought occurred in three separate years. According to this information what is the yearly frequency of drought percent?
To calculate the yearly frequency of drought as a percentage: Determine the total number of years in the 30-year period. Calculate the number of drought years. Divide the number of drought years by the total number of years, then multiply by 100 to get the percentage.
What grade is 8 wrong out of 30?
To find the grade percentage for 8 wrong out of 30, first calculate the number of correct answers, which is 30 - 8 = 22. Then, divide the number of correct answers by the total number of questions: 22/30 = 0.7333. To convert this to a percentage, multiply by 100, resulting in approximately 73.33%. Therefore, the grade is about 73%.
What is your percent if you miss 6 questions and there are 30 questions total?
To calculate your percentage, first subtract the number missed from the total; In this case, 30-6. Then from there you would take the answer (24) and divide it by the total number of questions (30). Then multiply your answer by 100. .80 * 100 = 80%
What is 30 million x 150?
To calculate 30 million multiplied by 150, you would first multiply 30 million by 150. This can be done by multiplying 30 by 150, which equals 4,500. Then, you would add the appropriate number of zeros to the end of the result based on the number of zeros in the original number. Therefore, 30 million x 150 equals 4,500,000,000.
How can the number of minutes in 30 days be calculated by?
To calculate the number of minutes in 30 days, multiply the number of minutes in an hour (60) by the number of hours in a day (24) and then multiply that result by the number of days (30). Therefore, 60 (minutes per hour) x 24 (hours per day) x 30 (days) = 43,200 minutes in 30 days.
30 minutes to 3 seconds is how many percent decrease?
30 minutes = 30 x 60 seconds = 1800 seconds to calculate the decrease from 1800 to 3 seconds we calculate the difference and then divide through by the start number so the difference is 1800- 3= 1797 and the original start number was 1800 so the decreae in percentage is 1797/1800 x 100% = 99.83 % decrease
What grade is 6 out of 30?
6 of 30 is 20%, so a 20. In letter terms, it means you failed. To calculate this on future exams, simply divide the number of correct answers by the total number of questions on the exam. On this one for example, divide 6 by 30, which is how you arrive at the answer, which is a score of 20.
How many moles of silver atoms are in 1.8 x 10 25 atoms of silver?
To calculate the number of moles, you divide the number of atoms by Avogadro's number (6.022 x 10^23). So for 1.8 x 10^25 atoms of silver, the number of moles would be 30 moles.
