Question

In lab you need to measure out 0.15 mol of C8H16O8C8H16O8 for an experiment. How many grams should you weigh out? Give your answer to 2 decimal spaces.

Answer #1

ANSWER;

The molar mass of C8H16O8C8H16O8 is (8 X 12.0) + (16 X 1.008) + (8 X 15.99) + (8 X 12.0) + (16 X 1.008) + (8 X 15.99) = 480.096g

0.15 moles can be calculated by the followin simple folrmula

Number of moles = Mass / Molar mass

Mass = Number of moles X Molar mass

Mass = ?

Number of moles = 0.15

Molar mass = 480.096g

**Mass = 0.15 X 480.096 = 72.04g**

**Hence we should weigh 72.04g.**

**NOTE: The
molecule is repition of two units C8H16O8, this may be a typo
mistake. So if the molecule is C8H16O8 then the molar mass is
240.048. In that case substitute 240.048g instad of
480.096g**

In lab you need to measure out 0.92 mol of C3H6O3C3H6O3 for an
experiment. How many grams should you weigh out? Give your answer
to 2 decimal spaces.

e. How many grams of HEPES (free acid) would you need to weigh
out to make 1 L of 50 mM HEPES?
f. How many mL of 1 M base (NaOH or KOH) would you need to add
to bring the pH to 7.4?
g. What components (and how much of each) would you add to a
beaker to make 1 L 50 mM HEPES, pH 7.4.

Please ANSWER BOTH QUESTIONS
1)Brontis is working in his lab. To continue his experiment, he
needs to calculate the total number of ions in 4.85 mol of MgCl2.
Calculate the total number of ions in 4.85 mol of MgCl2.
2)A chemist requires 0.885 mol Na2CO3 for a reaction. How many
grams does this correspond to?

1. A similar experiment was performed in lab and was carried out
by your instructor. THe data was collected and analyzed with the
use of Excel. The equation of best fit line was y= -5532.6x + 20.19
. Using the equation of the best fit line, calculate the heat of
vaporization ( Delta H vap) and the normal boiling
point (in degrees C) of this volitile liquid. (The
experiment pressure was measured in kPa not atm).
(Hint: What is the...

You need to make an aqueous solution of 0.162 M
iron(II) sulfate for an experiment in lab, using a
250 mL volumetric flask. How much solid
iron(II) sulfate should you add?
___ grams
How many milliliters of an aqueous solution of
0.207 M copper(II) acetate is
needed to obtain 7.15 grams of the salt?
____mL
In the laboratory you dissolve 24.2 g of
lead nitrate in a volumetric flask and add water
to a total volume of 125 . mL....

How many grams of solid silver nitrate would you need to prepare
250.0mL of a 0.200M AgNO3 solution? Express your answer
using three significant figures.
An experiment calls for you to use 100 mL of 0.30M HNO3
solution. All you have available is a bottle of 4.3M HNO3. How many
milliliters of the 4.3M HNO3 solution do you need to prepare the
desired solution?Express your answer using two significant
figures.
How many milliliters of water do you need to prepare...

1. Your supervisor asks you to prepare 250.00 mL of ammonium
buffer solution (0.15 M) with pH=9.00, from a concentrated ammonia
solution (25%w/w, d=0.91g/cm3) and solid ammonium chloride (98%
w/w). (MW of NH3 = 17.03 g/mol and FW of NH4Cl = 53.5 g/mol and
pKaNH4+/NH3 =9.24).
a) How many milliliters of the concentrated ammonia solution do
you need?
b) How many grams of ammonium chloride do you need?

You are conducting an experiment in which you measure two means.
Your null hypothesis is that they are the same (i.e. μ1 - μ2 = 0)
and your experiment will test this hypothesis with a confidence
level of alpha = 0.05. You would like to be able to detect a
difference in means of+/- 1 with a probability of at least 0.9. How
many samples do you need to test? The standard deviations of the
two groups are σ1 =...

If you can measure masses to +- 0.0001g in this experiment
(e.g., let us say that your sample mass is 0.1149g), and you know
that your volumetric pipet measures exactly 25ml and the molar mass
of Al(Ox)3 is 459.42g/mol, to how many significant figures should
[Al3+] results be reported?
For example, if the calculated [Al3+] is determined to be
exactly 0.1M, how would you report this value using the correct
number of significant figures?
Al3+ (aq) + 3Ox- (aq) ------>...

To make up a solution of PBS, you need 15 mM Na2HPO4 (141.96
g/mol), 0.25M NaCl (58.44 g/mol), and 2 mM KH2PO4 (136.09 g/mol).
How many grams of each will you need to make up 600 mL of PBS?

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 12 minutes ago

asked 14 minutes ago

asked 21 minutes ago

asked 21 minutes ago

asked 23 minutes ago

asked 41 minutes ago

asked 43 minutes ago

asked 56 minutes ago

asked 58 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago