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3 years ago

1. Calculate the molarity of 35g of calcium chloride (CaCl2) that is dissolved in 850ml of water. (Calculate moles first)

Chemistry

1 answer:

erastovalidia [21]3 years ago

6 0

Answer:

yo I got same question do u know it

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1. Consider the decomposition reaction of sodium chlorate. There are 100 grams of

IRINA_888 [86]

A. NaCl(s) and O2(g)

B. 2NaClO3(s) —> 2NaCl(s) + 3O2(g)

C. moles NaClO3 = 100 g / 106.44 g/mol = 0.939 mol NaClO3

D. 0.939 mol NaCl (because the NaClO3 and NaCl are in a 1 to 1 ratio)

E. grams NaCl = 0.939 mol • 58.44 g/mol = 54.9 g NaCl

F. moles of O2 = 0.939 mol NaClO3 • (3 mol O2 / 2 mol NaClO3) = 1.41 mol O2

G. grams of O2 = 1.41 mol • 32 g/mol = 45.1 g O2

H. Percent yield = 10/45.1 • 100% = 22.2% yield

6 0

3 years ago

Need help please omg Perform each of the following conversions being sure to set up the appropriate conversion factor in each ca

sertanlavr [38]

Answer:

The answer to your question is:

a) 31.75 cm

b) 0.475 miles

c) 2.44 yards

d) 11496.04 inches

Explanation:

Convert

a) 12.5 in to cm

1 in ------------------- 2.54 cm

12.5 in ---------------- x

x = 12.5(2.54)/1 = 31.75/ = 31.75 cm

b) 2513 ft to miles

1 mile -------------- 5280 ft

x miles ------------ 2513 ft

x = 2513(1)/5280 = 0.475 miles

c) 2.23 m to yards

1 m ------------- 1,094 yards

2.23 m ---------- x

x= 2.23x1.094/1 = 2.44 yards

d) 292 m to inches

1 m ---------------- 39.37 inches

292 m ------------- x

x = 292 x 39.37/1 = 11496.04 inches

6 0

2 years ago

Balance the following equation. Choose "blank" if no coefficient other than 1 is needed.

Ann [662]

Explanation:

Pb+2 AgNO3=Pb(NO3)2+2Ag

8 0

2 years ago

Read 2 more answers

Write the structures for all the isomers of the â€“C5H11 alkyl group.

seropon [69]

Answer:

Explanation:

Alkyl groups are those which are derived from alkane by the removal of one hydrogen atom

For example ,methane CH4, and its corresponding alkyl groups is methyl -CH3

5 0

3 years ago

A sample taken from a layer of mica in a canyon has 2.10 grams of potassium-40. A test reveals it to be 2.6 billion years old. H

Setler79 [48]

Problem One

Formula

N(t) = No * (1/2)^[t/t_1/2]

Givens

N(t) = the current mass of the sample = 2.10 grams

No = The original mass of the sample = No [We're trying to find this].

t = time elapsed which is 2.6 billion years or 2.6 * 10^9 years.

t1/2 = the 1/2 life time which is 1.3 billion years of 1.3 *10^9

Solution

2.10 grams = No (1/2)^(2.6*10^9/1.3 * 10^9)

The 10^9s cancel and you are left with 2.6/1.3 = 2

2.10 grams = No (1/2)^2

2.10 grams = No (1/4) Multiply both sides by 4

2.10 * 4 = No (1/4)*4

8.4 grams = No

which is how many grams you originally had.

Answer B.

Problem Two

$_{1}^{2}\text{H} + _{1}^{2}\text{H} \longrightarrow _{z}^{y}\text{x}+_{0}^{1}\text{n}$

Solve for y

2 + 2 = y + 1

4 = y + 1

y = 3

Solve for z

1 + 1 = z + 0

z = 2

The 2 tells you that it is the second member on the periodic table. That's Helium. So the answer looks like this.

$_{2}^{3}\text{He}$

The mass of the Helium is 3 and its number is two.

5 0

2 years ago