Q and A for the topic: General

Determine the empirical formula of a compound having the following percent composition by mass: K: 24.75%, Mn: 34.77%, and O: 40.51%

Large pizza are sold in cardboard boxes when closed the boxes measure 40cm by 40cm by 2.5cm and are cuboid. The company think it could use the same net but reduce the dimensions to 38cm by 38cm by 2cm. Sides and flaps all have a width of 2.5cm. Beth is asked to calculate the percentage reduction in cardboard if the smaller boxes are used. What answer should Beth get?.

2) One way of making sodium chloride is according to the following unbalanced equation: Na(s) + Cl2(g) → NaCl(s) In a reaction, a student mixed 3.00 grams of Na(s) with 6.2 grams of Cl2(g), making 7.60 grams of NaCl. Balance the equation and determine which, if any, of the starting materials was in excess? . [Molar mass (g/mol): Na = 22.99, and Cl = 35.45] 3) If 27.0 mL of 0.25 M NaCl aqueous solution are mixed with 36.0 mL of 0.42 M Ca(NO3)2 aqueous solution. Is there a reaction taking place? Find the molarity of each ion present in the final solution. 4) Vinegar contains acetic acid (HC2H3O2), which is responsible for its acidity. In one analysis, a 20.00 mL sample of vinegar was titrated with 0.50 M NaOH(aq). It required 35.5 mL of this sodium hydroxide titrant to neutralize the acid in the vinegar sample. If 1.000 liter of this vinegar weighs 1.008 kg, what is the percent, by weight, of acetic acid in this vinegar sample? . [Molar mass (g/mol): C = 12.01, H = 1.008, Na = 22.99, and O = 16] 5) A 50.0 mL sample of 18.0 M sulfuric acid was diluted with enough water in a volumetric flask to make 5.00x10^2 mL of solution. A 50.0 mL aliquot of this solution was then further diluted to a volume of 2.50x10^2 mL. What is the molarity of the solution after the second dilution?

Construct a set of six pieces of data with​ mean, median, and midrange of 67 and where no two pieces of data are the same.

Question 3 A square has a perimeter given by the algebraic expression 24x – 16. Write the algebraic expression that represents one of its sides.

Write a linear equation in the slope-intercept form. Slope of the line is -1 and goes through (8,4)

In a cheese factory, one pie costs 3800 denars. The fixed ones costs are 1,200,000 denars, and variable costs are 2,500 denars per pie. To encounter: a) income functions. profit and costs; b) the break-even point and profit and loss intervals.

An invoice for €2,880 plus default interest of €48.40 was paid on October 28th. Interest rate 5.5%. When was the bill due?

Find the number of liters of water needed to reduce 9 liters of lotion. shave containing 50% alcohol to a lotion containing 30% alcohol.

A plant found at the bottom of a lake doubles in size every 10 days. Yeah It is known that in 300 days it has covered the entire lake, indicate how many days it will take to cover the entire lake four similar plants.

5 1/9 + 2 2/3

97,210 ➗ 82 division

The car with an irresponsible driver starts to brake when it goes through a red light. When passing the traffic light, he does so at a speed of 115 kph in the right lane. Further ahead, 70 meters from the traffic light, a child is crossing the street and falls. If the effect of the car's brakes is equivalent to a deceleration of magnitude 5.7m/s². Is the child hit by the car or not? How far from the traffic light does the car stop?

Matilde knows that, when driving her car from her office to her apartment, she spends a normal time of x minutes. In the last week, you have noticed that when driving at 50 mph (miles per hour), you arrive home 4 minutes earlier than normal, and when driving at 40 mph, you arrive home 5 minutes earlier later than normal. If the distance between your office and your apartment is y miles, calculate x + y.

Suppose a car license plate consists of 2 letters and two digits of which the first cannot be zero. How many different plates can be engraved? consider only 26 letters and 10 digits draw an example of this.

To apply a diagnostic test, in how many ways can 14 students be chosen out of 25? if the order does not matter

A gas is leaking at 3.5ft3/min in a room of 2.9m by 6.9ft by 15.7m. How long would it take (in seconds) for 22% of the room to reach the LFL, if the gas has a LFL of 2.51%?

The domain of the function f(x)=x+7x2−144 is (−∞,), ( ,), and ( , ∞).

(3.1x10^3g^2)/(4.56x10^2g)

(3b)⋅(5b^2)⋅(6b^3)