Interpretation:
Whether the weight of
Concept introduction:
Molar mass of the molecule is equal to the sum of the
Mole is SI unit which is used to measure the quantity of the substance. It is the quantity of a substance which contains the same
The one mole of any substance is equal to the
Number of moles of compound can be calculated by below formula:
Number of moles =
A conversion factor is a numerical ratio which is used to show a measurement in one unit as another unit. It is always equal to 1.
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GENERAL CHEMISTRY-MOD.MASTERINGCHEM.
- 3.37 If atypical grain of sand occupies a volume of 1.3 × 10-4 cm3, what is the volume (in cm3) of 1 mole of sand (ignoring the space between grains)? What is the volume in liters?arrow_forwardOn October 21, 1982, the Bureau of the Mint changed the composition of pennies (see Exercise 120). Instead of an alloy of 95% Cu and 5% Zn by mass, a core of 99.2% Zn and 0.8% Cu with a thin shell of copper was adopted. The overall composition of the new penny was 97.6% Zn and 2.4% Cu by mass. Does this account for the difference in mass among die pennies in Exercise 120? Assume the volume of the individual metals that make up each penny can be added together to give the overall volume of the penny, and assume each penny is the same size. (Density of Cu = 8.96 g/cm3; density of Zn = 7.14 g/cm3).arrow_forward3.83 For the reaction of nitrogen, N2, and hydrogen, H2, to form ammonia, NH3, a student is attempting to draw a particulate diagram, as shown below. Did the student draw a correct representation of the reaction? If not, what was the error the student made?arrow_forward
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- A compound contains only Mn and F. The ratio of Mn and F is 1.73 moles of F per 1 mole of Mn. If the empirical formula is expressed as MnFx, what is the numerical value for x? If the formula is MnF5, you would enter the number 5. Please enter a whole number (i.e. round the number to the nearest whole number) and DO NOT include any units.arrow_forwardA researcher is using 7.20 x 1023 molecules of chlorine gas (Cl2) in an experiment. How many grams of chlorine is the researcher using? Remember to include units (abbreviated appropriately) and the substance in your answer. Round your answer to the nearest 0.01.arrow_forward3. Now let's suppose it's your turn to be the professor. You want to write a question for your students using theoretical data. Suppose you want their "unknown liquid" to be toluene (molar mass = 92.1 g/mol). Using the data in the table below, what should the "mass of flask + unknown condensed liquid" be so that they can correctly identify toluene as their unknown? Mass of flask: 77.485 g Mass of flask + unknown condensed liquid: ????? Temperature of water bath: 100 °C Pressure of gas in our system: 0.997 atm Volume of gas in our system: 255 mL Group of answer choices: A) 78.250 B) 0.765 C) 1.04 g D) 78.525 garrow_forward
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