2017年8月31日 · 0.76 is 76 one hundredth. Or, 76/100 76/100 = (4 xx 19)/(4 xx 25) = (color(red)(cancel(color(black)(4))) xx 19)/(color(red)(cancel(color(black)(4))) xx 25) = 19/25

2015年11月4日 · Find arcsin (0.76) Ans: 49^@46 and 130^@54 Use calculator: sin x = (0.76) --> arc x = 49^@46 The unit circle gives another arc x = 180 - 49.36 = 130^@54, that has the same sin value.

2018年4月7日 · A balloon contains 0.76 mol N2, 0.18 mol O2, 0.031 mol He and 0.026 mol H2 at 749 mm Hg. What is the partial pressure of O2?

2017年8月22日 · ln 1.76 = int_1^1.76 1/t dt ~~ 0.565 Hmmm. I'm not sure exactly what we are looking for here. We could try using the series: ln(1+t) = t-t^2/2+t^3/3-t^4/4+... but it ...

2015年1月25日 · The concentration of ions in solution depends on the mole ratio between the dissolved substance and the cations and anions it forms in solution. So, if you have a compound that dissociates into cations and anions, the minimum concentration of each of those two products will be equal to the concentration of the original compound. Here's how that works: …

2015年11月17日 · The parallax formula states that the distance to a star is equal to 1 divided by the parallax angle, p, where p is measured in arc-seconds, and d is parsecs. d=1/p Parallax is a method of using two points of observation to measure the distance to an object by observing how it appears to move against a background. One way to understand parallax is to look at a …

2015年2月9日 · It's a matter of adding up and taking percentages If you have a frequency table, you add a few columns to your table: Cumulative frequency Relative frequency Cumulative relative frequency Cumulative frequency You add the frequencies up to and including for the value Relative frequency You express the frequency as a fraction or percentage of total sum of …

x=10^(=0.123)=0.7534, nearly. For logarithm, with any base b, if c=log_b a, then the inverse relation is a=b^c For common logarithms, b =10 and b is in hiding..

2016年1月31日 · "pH" = 9 The idea here is that you need to use magnesium hydroxide's solubility product constant to determine what concentration of hydroxide anions, "OH"^(-), would cause the solid to precipitate out of solution.

2017年10月18日 · "pH" = 1.222 As you know, sodium hydroxide and hydrochloric acid neutralize each other in a 1:1 mole ratio as described by the balanced chemical equation "NaOH"_ ((aq)) + "HCl"_ ((aq)) -> "NaCl"_ ((aq)) + "H"_ 2"O"_ ((l)) This means that a complete neutralization, which would result in a neutral solution, i.e. a solution that has "pH" = 7 at room temperature, …