Question

Chalk contains 10% calcium, 3% carbon and
12% oxygen. Find the amount of carbon and
calcium (in grams) in 2-kg of chalk. ​

Answer 1

Ｅｘｐｌａｉｎ:

ᴀᴍᴏᴜɴᴛ ᴏғ ᴇᴀᴄʜ ᴄᴏᴍᴘᴏᴜɴᴅ ɪɴ 1ᴋɢ ᴄʜᴀʟᴋ:

ɪ) ᴄᴀʟᴄɪᴜᴍ = 100 ɢʀᴀᴍs

ɪɪ ) ᴄᴀʀʙᴏɴ = 30 ɢʀᴀᴍs

ɪɪɪ ) ᴏxʏɢᴇɴ = 120 ɢʀᴀᴍs

sᴛᴇᴘ-ʙʏ-sᴛᴇᴘ ᴇxᴘʟᴀɴᴀᴛɪᴏɴ:

ɢɪᴠᴇɴ ᴄʜᴀʟᴋ ᴄᴏɴᴛᴀɪɴs

10% ᴏғ ᴄᴀʟᴄɪᴜᴍ ,

3% ᴏғ ᴏxʏɢᴇɴ,

12% ᴏғ ᴏxʏɢᴇɴ

ɴᴏᴡ ,

1ᴋɢ ᴏғ ᴏғ ᴄʜᴀʟᴋ ᴄᴏɴᴛᴀɪɴs :

ɪ )ᴄᴀʟᴄɪᴜᴍ

= 10% ᴏғ 1ᴋɢ

= 10% x 1000 ɢʀᴀᴍs

/* 1ᴋɢ = 1000 ɢʀᴀᴍs */

= \ғʀᴀᴄ{10}{100}\ᴛɪᴍᴇs 1000 \: ɢʀᴀᴍs10010×1000ɢʀᴀᴍs

/* % = \ғʀᴀᴄ{1}{100}1001 */

= 100\: ɢʀᴀᴍs100ɢʀᴀᴍs ---(1)

ɪɪ )ᴄᴀʀʙᴏɴ

=3% ᴏғ 1ᴋɢ ᴄʜᴀʟᴋ

= 3% x 1000 ɢʀᴀᴍs

= \ғʀᴀᴄ{3}{100}\ᴛɪᴍᴇs 1000 \: ɢʀᴀᴍs1003×1000ɢʀᴀᴍs

= 30\: ɢʀᴀᴍs30ɢʀᴀᴍs ---(2)

ɪɪɪ) ᴏxʏɢᴇɴ

=12% ᴏғ 1ᴋɢ

= 12% x 1000 ɢʀᴀᴍs

=\ғʀᴀᴄ{12}{100}\ᴛɪᴍᴇs 1000 \: ɢʀᴀᴍs10012×1000ɢʀᴀᴍs

= 120\: ɢʀᴀᴍs120ɢʀᴀᴍs ---(3)

ᴛʜᴇʀᴇғᴏʀᴇ,

ᴀᴍᴏᴜɴᴛ ᴏғ ᴇᴀᴄʜ ᴄᴏᴍᴘᴏᴜɴᴅ ɪɴ 1ᴋɢ ᴄʜᴀʟᴋ:

ɪ) ᴄᴀʟᴄɪᴜᴍ = 100 ɢʀᴀᴍs

ɪɪ ) ᴄᴀʀʙᴏɴ = 30 ɢʀᴀᴍs

ɪɪɪ ) ᴏxʏɢᴇɴ = 120 ɢʀᴀᴍs

•••

$thank \: you \: very \: much$