If a reaction occurs, what will be the products of the unbalanced reaction below?

How many moles of liquid water must freeze to remove 100 kJ of heat? (ΔHf = –334 J/ g.

Juliette [100K]

First figure out how many grams must freeze and then convert the grams to moles.
Hf = -334 J/g. Convert this to KJ/g by dividing by 1000. (There are 1000 Joules in a kJ). 
Hf = -334 J/g ÷ 1000 J/kj = -0.334 kJ/g 
Now, divide 100 kJ by -0.334 kJ/g (see how the units are lining up?) 
100 kJ ÷ -0.334 kJ/g = 299 g 
Now convert this to moles by dividing by the molecular weight of water (18.0g/mole). 
299 ÷ 18.0 = 16.6 moles

5 0

4 years ago

A water bath in a physical chemistry lab is 1.85m long, 0.810m wide and 0.740m deep. If it is filled to within 2.57 in from the

jenyasd209 [6]

Answer:

The volume of water in water bath is 1,011 Liters.

Explanation:

Length of the water bath, L = 1.85 m

Width of the water bath, W= 0.810 m

Height of the water bath ,H= 0.740 m

Height of the water in water bath, h= 0.740 m - 2.57 inches

1 m = 39.37 inch

$= 0.740 m - \frac{2.57}{39.37} m = 0.6747 m$

Volume of the water in bath = L × W × h

$=1.85 m\times 0.810 m\times 0.6747 m=1.011 m^3$

$1 m^3=1000 L$

$1.011 m^3=1.011\times 1000 L=1,011 L$

The volume of water in water bath is 1,011 Liters.

6 0

4 years ago

What happens when a gamma ray is emitted from nucleus of an atom

Masja [62]

Answer:

The emission of gamma rays does not alter the number of protons or neutrons in the nucleus but instead has the effect of moving the nucleus from a higher to a lower energy state (unstable to stable). Gamma ray emission frequently follows beta decay, alpha decay, and other nuclear

Explanation:

because im smart

8 0

4 years ago

How many grams of iron(III) oxide (Fe(OH)3) may theoretically be produced from 85.0 g FeCl3?

Crank

Answer:

56.0 g

Explanation:

Calculation of the moles of $FeCl_3$ as:-

Mass = 85.0 g

Molar mass of $FeCl_3$ = 162.2 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{85.0\ g}{162.2\ g/mol}$

$Moles= 0.52404\ mol$

According to the reaction:-

$FeCl_3+3 NaOH\rightarrow Fe(OH)_3+3 NaCl$

1 mole of $FeCl_3$ on reaction forms 1 mole of $Fe(OH)_3$

Also,

0.52404 mole of $FeCl_3$ on reaction forms 0.52404 mole of $Fe(OH)_3$

Moles of $Fe(OH)_3$ = 0.52404 moles

Molar mass of $Fe(OH)_3$ = 106.867 g/mol

Mass = Moles*Molar mass = $0.52404\times 106.867\ g$ = 56.0 g

8 0

3 years ago

The compound adrenaline contains 56.7 % c, 6.56 % h, 28.37% o and 8.28 % n by mass. what is the empirical formula for adrenaline

-Dominant- [34]

Answer:- An empirical formula of adrenaline is $C_8H_1_1O_3N$ .

Solution:- Convert given percentages to moles and then calculate the mol ratio to get the simplest whole number ratio of moles of atoms which is the empirical formula of the compound.

$C=\frac{56.7}{12}$ = 4.725 mol