C_(2)H_(8)N_(2) dimethylhydrazine, rocket fuel Express your answer to four significant figures. square %

Atoms: The Building Blocks of Matter John has 1 mole of an element, but doesn't tell you what the element is. But you do know how many isotopes of the element he has. how much volume of the element he has. how many grams of the element he has. how many particles of the element he has.

1. Calculate the change in entropy in J/K for A. the vaporization of 50.0 g of benzene (C_(6)H_(6)) at its boiling point of 80^circ C.Delta H_(vap)=31.0kJ/mol B. the melting of 50.0 g of benzene (C_(6)H_(6)) at its freezing point of 5.5^circ C.Delta H_(fus)=9.92kJ/mol

What is the volume when 524cm3 of a gas at 491 K is cooled to 297 K? 491 K is T_(1) and 524cm3 is V_(1) What variable is V_(2) ? unknown 297K 524cm^3

Native metals are __ Found only in one place mixtures of more than one metal refined from ores found as pure metals resistant to corrosion

Drag the tiles to the boxes to complete the pairs. Match the elements to their periodic table groups based on their uses or properties. Element is used as a disinfectant & }(l) Element important for the proper functioning of the human body. Element always stored under oil. & Compounds of this element are used in manufacturing of paints. group 3-12 & group 1 & group 17 & group 2 &

When CuCl_(2) reacts with NaNO_(3) , NaCl and Cu(NO_(3))_(2) are produced as shown in the following balanced chemical equation. CuCl_(2)+2NaNO_(3)arrow 2NaCl+Cu(NO_(3))_(2) Suppose 19.35 g CuCl_(2) reacts with 20.31 NaNO_(3) Determine how many moles of Cu(NO_(3))_(2) will be produced if 19.35 g CuCl_(2) reacts with excess NaNO_(3) The molar mass of CuCl_(2) is 134.45g/mol

6.2 g of an ionic compound is dissolved in a coffee-cup calorimeter containing 100.0 g of water at 16.2^circ C The temperature of water increased to 19.5^circ C What is the Delta H of the dissolution process in kJ/mol of compound)? Assume that the specific heat of the solution is same as specific heat of water (4.184 J/g^circ C) The molar mass of the ionic compound is 72.1g/mol

A 32.1 g sample of an unknown substance is heated to 89.0^circ C and then was plunged into 55.0 mL of 20.0^circ C water in a coffee cup calorimeter. The temperature of the water rose to 28.1^circ C Calculate the specific heat of the metal. Specific heat of water=4.184J/g^circ C Density of water=1.00g/mL. a) 0.528J/g^circ C b) 0.606J/g^circ C C) 0.713J/g^circ C d) 0.953J/g^circ C e) 0.216J/g^circ C

In the combustion of methane (balanced reaction shown below), what are acceptable ratios of methane to oxygen to ensure complete combustion? CH_(4)+2O_(2)arrow CO_(2)+2H_(2)O 1CH_(4):4O_(2) 2CH_(4):1O_(2) 1CH_(4):3O_(2) C 1CH_(4):1O_(2) 0.5CH_(4):1O_(2)

Hot Questions

A synthetic lubricant presently used with ternary blends containing HCFCs is known as __ Alkylbenezene Polyalkylene Polywannacracker Polyolester

Which of the following equations is correct? $TC=FC+VC$ $TC=FC-VC$ $TC=MC-VC$ $TC=FC\times VC$

vphich pure substance can be classified as an element? $H_{2}$ $NO_{3}$ NaCl $H_{2}SO_{4}$

What is the approximate pH at the equivalence point of a weak acid- strong base titration if 25 mL of aqueous HF requires ; 30.00 mL of 0.400 M NaOH? $K_{a}HF=6.76\times 10^{-4}$ a. 1.74 b. 5.75 c. 8.25 d. 12.26

Question 3 of 10 What property is used to calculate the pH of a solution? A. The hydrogen ion concentration in ppm B. The hydrogen ion concentration in $mg/dL$ C. The hydrogen ion concentration in $mol/L$ D. The hydrogen ion concentration in $mol/kg$

How many valence electrons are in the acetate ion $C_{2}H_{3}O_{2}^{-}$ $\square $

Which statement would be the most useful for deriving the ideal I gas law? Volume is directly proportional to the number of moles. Volume is inversely proportional to the temperature. Pressure is directly proportional to the volume. Pressure is inversely proportional to the number of moles.

Hydrogen sulfide is: A) Odorless B) Colorless C) Not flammable D) Red in color

Question 18 of 20 What is the name for $Mg_{3}N_{2}$ A. Magnesium nitride B. Magnesium dinitride C. Trimagnesium dinitride D. Dimagnesium trinitride

Give the IUPAC name for the organic compound shown: $CH_{3}-CH-CH-CH_{2}-COOH$ chloro-isopropyl alcohol 3-chloropentanoic acid 3-chloropentanone 2-chloropentanal