From Questions to Solutions

What is the mass number of an element which has 43 protons, 46 neutrons, and 43 electrons? A. 132 B. 3 C. 86 D. 83706 E. 89 F. -46 G.

What percent of 64 is 39.4? Round your answer to the nearest hundredth.

The vapor pressure of ethanol is [tex]1.00 \times 10^2 \, \text{mmHg}[/tex] at [tex]34.9^\circ\text{C}[/tex]. What is its vapor pressure at [tex]53.7^\circ\text{C}[/tex]? (The enthalpy of vaporization for ethanol, [tex]H_{\text{vap}}[/tex], is [tex]39.3 \,

A 2.75 molar aqueous solution of glucose has a density of 1.17 g/mL. What is the mass percentage (% m/m) of glucose in this solution? Glucose has a molar mass

Determine \(\Delta G°\) for the reaction: \[2 \text{NO}_2(g) \rightarrow \text{N}_2\text{O}_4(g)\] at 25°C. Given: \[\Delta G°_f (\text{NO}_2) = 51.3 \, \text{kJ/mol}\] \[\Delta G°_f (\text{N}_2\text{O}_4) = 97.8 \, \text{kJ/mol}\]

Noam had a length of [tex]13 \frac{1}{3} \, \text{cm}[/tex] of ribbon and cut it into [tex]3 \frac{1}{3}[/tex] equal-sized strips, each the full width of the ribbon. How long is each

Given the vectors in component form: [tex] \[ \begin{array}{l} r = \langle 8, 4 \rangle \\ s = \langle -3, -4 \rangle \\ t = \langle -5, 1 \rangle \end{array}

The following refers to the data set: 116.8, 116.8, 116.8, 72.1, 83.1, 101.3, 90.9, 97.6, 83.7, 98.4. What is the arithmetic mean of this data set?

Nathan draws a triangle on the coordinate grid with points at [tex](1, 5)[/tex], [tex](4, 1)[/tex], and [tex](-4, -5)[/tex]. What is the perimeter of the triangle, rounded to the nearest tenth

Which of the following lists correctly identifies the healthy range of a vital sign? A. The healthy range for blood pressure is 120/80 mm Hg or higher. B. The healthy

Write the equation that models the problem: 3.5% of 220 is what number? [tex]0.035 \times 220 = x[/tex]

How many molecules of glucose are in 36.6 g? The molar mass of glucose is 180.156 g/mol. A. 1.02 x 10^22 molecules B. 2.04 x 10^22 molecules C. 3.06 x

The song "Tom Dooley" by the Kingston Trio is a story song based on true events. The song broke the barrier of folk music being for oldies and became popular

Two lamps rated at 25 W, 220 V, and 100 W, 220 V are connected to a 220 V supply. Calculate the power consumed by the lamps.

Find the equivalent temperatures in Celsius, Fahrenheit, and Kelvin. a) Convert 69°C to Fahrenheit and Kelvin. b) Convert -29°F to Celsius and Kelvin. c) Convert 111 K to Celsius and