All categories

3 years ago

What does the number 7 mean in the following example-73Li?

Chemistry

1 answer:

Pavlova-9 [17]3 years ago

4 0

Answer:

7 is the mass number of li and 3 is the atomic number

a 3

b 7

c 3

d 4

You might be interested in

How many grams of a 22.9% sugar solution contain 68.5 g of sugar?

777dan777 [17]

The grams of 22.9 % sugar solution that contain 68.5 g of sugar is 299.13 g of solution

calculation

22.9% means that there are 22.9 g of sugar in 100 g of solution.

what about 68.5 g of sugar

- by cross multiplication

=[(68.5 g sugar x 100 g solution) /22.9 g sugar] =299.13 g of solution

Nb; g sugar cancel each other

5 0

3 years ago

What is the exact mass of one mole of carbon-12 atoms

love history [14]

One atom of carbon weighs exactly 12/6.022x10^23 = 1.9927x10^-23 grams.

3 0

4 years ago

How might cancer of the testes affect a man's ability to make sperm

evablogger [386]

It might affect that by making the testes grow uncontrollably so it can't make

3 0

3 years ago

For many purposes we can treat ammonia NH3 as an ideal gas at temperatures above its boiling point of −33.°C. Suppose the temper

Keith_Richards [23]

Answer:

The new pressure will be 0.225 kPa.

Explanation:

Applying combined gas law:

$\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}$

where,

$P_1\text{ and }V_1$ are initial pressure and volume at initial temperature $T_1$ .

$P_2\text{ and }V_2$ are final pressure and volume at initial temperature $T_2$ .

We are given:

$P_1=0.29 kPa\\V_1=V\\P_2=?\\V_2=V+50\% of V=1.5 V$

$T_1=-25^oC=248.15 K$

$T _2 = 16^oC=289.15 K$

Putting values in above equation, we get:

$\frac{0.29 kPa\times V}{248.15 K}=\frac{P_2\times 1.5V}{289.15 K}$

$P_1=0.225 kPa$

Hence, the new pressure will be 0.225 kPa.

4 0

4 years ago

Who can answer these?

sesenic [268]

For the first one.. the Reactant side is Zn+2HCl produces Zncl2 and H2... and it is balanced too

6 0

3 years ago